Market Education
An asking price is not a comp: how to read the card market honestly
Active listings show seller expectations. Completed sales show what buyers actually paid. Knowing the difference prevents costly valuation mistakes.
Start with completed transactions
A card listed for $500 has not established a $500 market value. It only tells you what one seller hopes to receive. A useful comparable sale is a completed transaction involving the same card, parallel, grade, and grading company whenever possible.
Recent sales deserve more weight than older sales, but a single result can still be misleading. Condition, eye appeal, certification, auction timing, seller reputation, and unusually motivated buyers can all move one result away from the broader market.
Use a range, not false precision
When several reasonable matches exist, look at the median and the spread rather than selecting the highest sale. When matches are weak, label the estimate as low-confidence instead of forcing a number.
- ✓Match year, set, card number, parallel, and variation
- ✓Separate raw cards from graded copies
- ✓Do not mix grading companies or grades without an explicit adjustment
- ✓Exclude obvious lots, altered cards, and unrelated memorabilia
- ✓Record the date and source of every estimate
Track your result separately
Estimated market value and realized profit are different measurements. My Slab Stats keeps cost basis, estimated value, sale price, fees, and expenses separate so a collector can see what actually happened after a card sells.
Editorial policy
My Slab Stats distinguishes confirmed information from opinion, links primary sources when reporting outside developments, and treats all card values as estimates—not guarantees or financial advice.