I collected thousands between roughly 1978 and 1987. George Foster was my favorite player and I couldn't have been more excited when I got his rookie card from a local shop.
I still have most of them, the best ones in plastic sleeves but all of them in shoeboxes. I haven't looked at them in years and I'm a little afraid of what kind of condition they might be in. I loved collecting though; great part of my childhood/adolescence.