Definitely play them; the alternative is not even a consideration. I really don't get my kicks from just owning games. They aren't something that I get kicks from just looking at them sit on a shelf, like a painting. I do like seeing them on a shelf, because I like seeing anything I own organized and tidy, but it's all about having access to them to play.
Games just aren't the sort of thing that I feel are collectable like stamps and coins at this point.