The one thing I missed out where crazy insert, like the ones going for big money nowadays that aged extremely well. Probably the most high-end cards I bought were Fleer Ultra, and I did pull some nice cards out of those. I remember pulling a few 1:36 cards and being pretty excited. This one comes to mind:
|Image from COMC|
What I did miss out on were the big time cards - notably inserts and parallels - that have absolutely skyrocketed in value since the late '90s. In fact, a Michael Jordan 1997-98 Precious Metal Gems card just sold for....$350,100! Read about it here if you missed it.
|Image from Sports Collectors Daily|