Having returned from Texas with a 20+ year-old game (Wizards) I hear isn't very good (and I am unlikely to play in any case) and two 30+ year-old supplements for a game (Powers & Perils) I have never played, am unlikely to, and I don't known where I might have stored the core rules for, I am forced to ponder what is it about old games, anyway?
I am something of a collector, true and as Batman's Batcave and Superman's Fortress of Solitude have long demonstrated, it's cool to have a good collection on display. Still, books, comic books, movies--all of those I generally get the intended use out of as well as the collecting aspect. The games not as much.
There's a bit of nostalgia, sure. I remember seeing these things on shelves sometimes or I saw them advertised in Dragon and the like. I think it's also a bit of my love or history and archaeology. These products are a window into the past. They even smell old, whether through the smell of old paper only or musty rooms where cigarettes were smoked (and probably the less pungent Mountain Dew and snack foods consumed). They're a tangible connection to a hobby that, while relatively young, is older than I am.
How about you guys? Do you like old games even if you don't play them?