I don't think I've ever heard of someone pulling a winner of a card out of the middle of one of these abominations, so they are purposely created (and priced) to play on the hope of the unknown.
If you ever choose to buy one, the decision should be based solely on the cards that are showing. I bought one a bunch of years ago, because it had an impossible to find centered 1972 Topps #40 Bob Barton IA card on front, which was nice. Behind it? Of course, zilch.
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