You really have to like a specific game a LOT before you get into mods.
That's one thing I've noticed about heavy PC gaming fans; they often play the same game for the better part of ten years (not exclusively obviously).
But there are a lot of people who like tooling around with in-game resources for the amusement factor, and in some instances (many of the HL-2 mods) players/artists/coders can actually improve the game by giving the textures and even lighting effects updates(Crysis).
Of course not every gamer is into that. Overall it's a pretty small niche within PC gaming. But if that's your thing, naturally you'll think PC gaming is where its at.







