Quote:
Originally Posted by Snowman
Beware of selection bias when it comes to percentages of alterations by vintage vs modern since you can't really identify a "properly" trimmed card without having before and after photos (hence they're getting through grading, and no, a roller doesn't solve the problem). Vintage cards "worth trimming" are much more likely to have already been graded and sold before than modern cards, so there will be a selection bias in terms of what cards get discovered by BODA since their only way of identifying these is by looking up card scans online from prior sales. But in terms of the unknowable true number of trimmed cards in slabs that exist today? I would wager good money that the vast majority are actually modern cards and that they'll never get found out.
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I would absolutely agree with this assessment.