When I was in high school, me and my friends were obsessed with games and browsed GAF daily. Since moving onto college, even though I've met a lot of people who game a lot and beyond the typical Call of Duty/ Madden popular titles I've only met a single person who knows GAF, and he doesn't read it or have an account, he's just heard of it.
Meanwhile everyone's at least heard of Reddit.
Maybe my experience isn't normal but it seems to me that despite its influence in the industry and among the hardcore, GAF really isn't known outside those communities.
So yeah, working at GAF may be a personal dream, but I'm not sure how cool it'd be to advertise it outside of e3 or PAX or whatever.