GMs -- Don't we all want to roll our own?

[balzacq]

Originally Posted by Luke Bunyip

Rhetorical Q: If you could write your own Sci Fi or Fantasy fiction, would you do most of it in your own setting(s), or would you write fan fiction that tried to act as mortar between the bricks of someone elses milieau?

Obviously, I would choose the first.

But in thread after thread on these forums, I hear over and over GURPS has no ready-made worlds I'd buy GURPS if there was a supported setting Making my own world is too much work blah blah blah waaahmbulance. WTF?

I mean, obviously people bought Greyhawk and Forgotten Realms in droves (and then shelled out major bucks for all that hack fiction set therein). Is this a symptom of GMs just wanting to be super-players instead of world creators? And what proportion of GMs does that cover?