As an actual gamer... why? I mean of course I agree that if I buy a game I should play however I want (assuming it doesn't degrade the game for others, i.e. no online cheating in competitive settings but modding is fine, including online if other players agree to it) for whatever long the agreement priced was (e.g. I don't think it's OK to get a lower price for a 1-day trial then keep it forever but if I do pay full price, then I get to keep it)... and yet, when I play a game, I play it. I don't store it. Sure I might want to maybe play it again in 10 years but the actual likelihood of that is very VERY low. I say this owning few dedicated arcade hardware running MAME and similar emulators.
TL;DR : I go get the point, my behavior though is not that, namely I play, complete (or not) then move on.