I do have games in my collection that I bought and haven't played. But I do have the intention to play them at some point.
I wouldn't, for example, buy Nights Into Dreams on Saturn. I know it's highly collectible, and a cornerstone to many people for a Saturn collection. But I frankly didn't like the game.
Nonetheless, I still consider myself a collector. Same thing goes for comics. For example, I won't buy Spawn because it's all style and no substance, IMO. But I have a collection of over 4,000 comics. (I think I have read every comic in my collection, though, unlike my game collection).
While I don't have the numbers a lot of you guys have, I do have a pretty modest collection of games, IMO. Definetly more than your average gamer.