Market manipulation in baseball cards is super easy, I see it happen all the time, sometimes on purpose and sometimes by accident. Just go to a forum or a few forums hype the crap out of something. Get a few people to help and bingo a nice return on investment.
On this forum you don't have to look farther than MattyC to understand how it works. His constant posts about perfect centering had a affect on card prices. I don't know if he just liked centered cards or if he was flipping them to make $ but his posts did affect prices.
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