I would trade in my games if I do not play or care about it anymore. Like what is the point of keeping them?
I pretty much agree, I'd guess some people keep them hoping they will be worth even more someday which happens once in a while or they think they may play them again one day.
I can say if had kept everything I ever had there are just a handful out of hundreds I'd play for an hour or two.
I like the buy high sell high tactic. I bought Skyrim for $ 60 put 200 or so hours on it and resold for $45. That's about $15 I paid for 200 hours of entertainment. Not bad. o(^▽^)o