I also used to buy almost every game that I saw that was under $5 unless it was a horrible game during the PS2/GameCube/XBox generation of consoles and for much of last generation. It was difficult not to when so many stores like Sears, Kmart, TRU and Circuit City all had regular clearance deals. I also agree it was about the thrill of finding the games. It was a lot of fun to go into a store with your printed list, find a game tagged for $49.99 and know it would scan for a few dollars. I didn't have time to play every game and ended up not finishing most of them. Now I only buy games I really want and try to finish every new game I buy.
I 100% every game I play. Unfortunately with some games like Assassin's Creed nowadays, their length is extended with bloat, and I suffer through to finish some games. Now I have a bunch of RPGs I'm dying to play like Persona 5 or Kingdom Hearts, though I know they're 100 hour games and that will take me months just to play one.