A card can go from 50 cents to $10 if the player starts to have a few good games. You have to keep track of their stats. It is kind of like the stock market. If the player has a good performance, the cards will do really well.
Hockey cards are on fire this year. Yankees' cards are always popular. I don't think I could ever make it if I just did baseball or football.
I still had a lot of cards that didn't get ruined. I had a lot of stuff at home. But cards don't take water very well.