For many reasons, there's always been cards which seem like commons but have a much greater value.
Here's a couple:
Jim Morris 2000 spx and Bowman Chrome:
Disney made a movie about him and his very limited amount of cards make them popular.
2001 Topps Traded Bat Ed Rogers
It's been a long time but I believe it's very short printed and last I recall, they have sold for over $50
2009 Topps Heritage Chrome Jerry Hairston jr.
For whatever reason, the REGULAR version is non existent and has sold for around $100
Also, a couple of 1994 Pinnacle Museum cards were redemptions and are very tough to find causing them to sell for a lot more than usual.
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