sounds like you just buy them cause they are cheap. most of them are probably slop. i bought a ton of games below 1 dollar at kinguin, but those were actually in my whishlist, i was waiting for them to play.
your case is similar to a collector, than an actual user. collecting can be a hobby, and if you feel comfortable in your financial situation...then keep buying them mate. if you dont, then try to set goals and boarders, make a sub bank account just for games or something.