My dad and I collected cards during the 1980s boom. We have complete sets for Topps, Fleer and Donruss for about 10 years starting in 1981. My dad would buy a set for me to put into plastic sheets to look at and then would usually buy at least one extra for the investment. He and I have different personalities so I would drive him crazy when I would look at the cards while we were putting them in plastic sheets. He was always telling me I could do that later after we got done
We probably have a hundred thousand cards in the closet at their house now.
My favorite player growing up was Reggie Jackson. I have all of his major issue cards (Topps, Fleer Donruss) for his entire career in plastic cases. His rookie card is my most valuable card. At one time, it was about $800. I have lost track what it's worth is now, but I would never consider selling any of my Reggie cards.
I still buy a few packs each year just to see what they look like. Personally, I really enjoy the stories about the old cards and people finding lost treasures.