Its made me cheap because I don't actually think anything is worth over 20$, every single DLC included. Yet AAA games think they're worth 100$+. Well, uh, nooooo. Sales make them worth what they actually are. And until games actually start going back up in -actual- quality instead of just costing millions for nothing, I'll start buying at full price again.
I also think indie games are equally overpriced in general and wait for sales all the time. A glorified flash game is not worth 15$.