http://www.cardboardconnection.com/why-sports-cards-early-90s-worthless
This is an ok read about why all those late 80's/early 90's cards aren't worth anything. I still pick up a pack of 1987 Topps every once in a while for the nostalgia. In a few weeks I'll get the itch to buy a bunch of packs of the new Topps Heritage set, but I'll probably never get around to collecting a complete set ever again.