Episode 29 1 Year of Selling Sports Cards: Buying (Part 1)

Released: November 11, 2025 | Duration: 29:59

Prefer audio-only? spotify slabnomics podcast linkslabnomics apple podcasts link

About This Episode

The buying decision is the one that determines whether you ever get to celebrate a sell. Most people figure this out the hard way – after sitting on inventory that will not move at any price, after eating grading fees on cards that came back wrong, after watching the market move toward something they do not own. This episode is the honest accounting of a first year.

It started with vintage baseball collections bought off Facebook Marketplace, the assumption that Hall of Famers from the junk wax era would grade out well, and the lesson that high population counts are a ceiling, not a floor. From there the arc moves through arbitrage attempts across secondary auction houses, the discovery that liquidity is more important than rarity, the mechanics of bulk discounts and motivated seller identification, and the discipline framework that ties it all together: the Sleep On It rule.

What comes through across the whole year is that buying strong is a learnable skill, not a natural instinct. The decision process improves when you pre-grade instead of guessing, track your predictions versus actual grades, and buy cards you can articulate a buyer for – not cards you simply believe are undervalued. Belief without a market to validate it is just inventory.

Topics Covered

  • How the journey started: Spain, a Messi rookie at a Barcelona market, and the beginning of a collecting education
  • The junk wax trap: why Hall of Famer cards from the 1980s and 1990s fail as grading targets despite the names attached
  • Grading as leverage: the theory behind raw-to-graded, the reality of a first PSA submission returning mostly sixes and sevens
  • Pre-grading as a discipline: using three-dollar pre-grade services before committing to twenty-dollar PSA submissions
  • How to read your own results: logging grade predictions, tracking variance, improving calibration over time
  • The liquidity lesson: why cards that have not sold in twelve months are almost impossible to sell regardless of perceived value
  • Rarity for rarity’s sake: why low print runs without corresponding demand produce illiquidity, not value
  • Bulk discounts and motivated sellers: bundling multiple cards to extract ten to fifteen percent extra, reading where sellers are in their ownership cycle
  • Seasonality: buying in the offseason, selling into on-season momentum, and using catalysts like hype cycles as exits
  • The Sleep On It rule: why the card is almost always still there in the morning, and why overnight perspective cuts bad buys

Full Transcript Summary

How It Started: Spain, a Messi Rookie, and a Missing Education

The entry into sports cards happened in Barcelona. Walking through a Sunday market outside a church, a Messi rookie appeared – the 2004 Autograph Barcelona set, card number 89. It was a facsimile autograph, not a real one. The host looked it up, got confused about whether it was fake, and passed. The card was probably fifty euros. A year later, he went back for thirty of them.

That story matters because it illustrates the entry condition for most people who get serious about this hobby: you are learning to see something that you cannot yet see. The value was always there. The framework to recognize it had to be built.

The first instinct was to go to Facebook Marketplace, find storage unit buyers who did not want to sort through sports cards, offer them a few hundred dollars, and make money on the grading spread. This is a reasonable idea in theory. In practice, it depends on two things you do not have when you start: an eye for condition, and an understanding of which cards have any value at their graded ceiling.

The Junk Wax Trap

The first real lesson was the junk wax era. Cards from the 1980s and 1990s – the era of mass production, where Topps and Donruss and Fleer flooded the market with hundreds of millions of copies of every set – are not grading opportunities no matter how famous the player is. A Carl Malone. A Magic Johnson. Recognizable names that look clean to an untrained eye. Population reports showing tens of thousands of already-graded copies. Graded nines and tens that are worth less than the cost of the submission.

The first PSA batch came back with a lot of sixes, a lot of sevens, some fives, two tens worth sixty-five to seventy dollars each. The rest covered grading costs in a handful of cases and lost money in most. That is the junk wax lesson rendered in real dollars: high population is a ceiling on value, not a floor, and the condition standards required to grade well are different from what looks clean on a kitchen table.

The fix is pre-grading. Services exist that will evaluate a card’s grade probability for around three dollars per card. That three dollars is consistently cheaper than submitting a card at twenty-two dollars and having it come back as a six. More importantly, the exercise of comparing your pre-grade estimate to the service’s estimate, and then comparing both to what PSA actually returns, is how you build calibration. Track the variance. Find where you are systematically wrong. Fix those blind spots one batch at a time.

The Liquidity Lesson: Rarity Without Demand Is Just a Hard Sell

After grading, the next phase was arbitrage – buying cards on secondary platforms like Hibid and Heritage where volume was lower, then flipping on eBay where volume was higher. The theory was that price discovery on lower-traffic platforms would lag the market. In practice, the cards that slipped through the cracks on secondary platforms were usually slipping through the cracks for a reason.

Cards that have not sold in twelve months are essentially impossible to sell. The first thing any serious buyer does is check comps. If comps are sparse or old, they move on. The effort required to close a sale on a card with weak comp history is too high relative to the available alternatives. That friction compounds when you are trying to flip quickly.

This is the rarity trap. A one-of-one from a 2016 set of a player nobody actively collects is not a valuable card because it is scarce. It is a problem because the number of people who would pay a premium for it is small, those people are hard to find, and the price discovery required to agree on a number is difficult when no reference transactions exist. Rarity without demand is just illiquidity – and illiquidity is the worst outcome in a business model that depends on velocity.

The correction is to buy for liquidity first. Buy cards where you can picture the buyer, where comps exist, where the demand is legible. The card that sells in two weeks at a fifteen percent margin compounds faster than the card that sits for six months waiting to prove you right.

Bulk Discounts, Motivated Sellers, and Timing

Once you stop chasing rarity and start buying liquid cards, the leverage moves to acquisition price. Two techniques work reliably.

The first is bundling. When you are interested in multiple cards from the same seller – on eBay, Instagram, at a card show, anywhere – start with one card, establish a price comfort zone, and then add the others. Sellers who would not move meaningfully on a single card will often offer ten to fifteen percent off the bundle because it simplifies their situation. The more motivated the seller, the more this works.

The second is reading where the seller is in their ownership cycle. Someone who says “I don’t really want to sell it, I’m just putting it out there” just listed that card. They are at peak attachment. That is not your negotiating window. Someone who listed three months ago, has been watching it sit, and is starting to talk about what else they could do with the capital – that is your window. Language is the tell. Listen for it.

Timing the broader market is the third component. Buying Shohei Ohtani in the offseason and selling when he is three games into April with a .400 average and ESPN is doing daily segments is the simple version of this strategy. Most sports have a predictable rhythm of attention. Demand concentrates when the sport is live and newsworthy, then dissipates in the offseason. Entry at the bottom of that cycle and exit at the peak is not a complicated thesis – it is just patience applied to something most people know but do not act on.

The Sleep On It Rule

The episode closes with the most durable single piece of advice from the year: sleep on buying decisions. The card is almost always still there in the morning. The immediate rush of wanting something is a worse filter for investment decisions than almost any other decision-making mode. Nine out of ten times, overnight perspective reduces the enthusiasm. Five or six out of ten times, a better opportunity has appeared in the morning, or the original thesis has started to feel shakier without the urgency that was driving it.

The card market does not require speed on most transactions. The exceptions: truly rare cards, competitive auctions, time-sensitive situations are real but uncommon. For the other ninety percent of buying decisions, sleeping on it is the cheapest protection available against impulse spending.

Related Episodes