I think the first question like you rightfully asked is what genre are they interested in. In my experience as well, 90% of those who play FPS and fighting games (from the dawn of time), play them for MP. Games like hack n slash and RPGs on the other hand are played for SP. I think its more of a genre thing and it doesn't mean that these guys would have no interest in a game like GoW3 because there's no MP
"Dr. Tenma, according to you, lives are equal. That's why I live today. But you must have realised it by now...the only thing people are equal in is death"---Johann Liebert (MONSTER)
"WAR is a racket. It always has been.
It is possibly the oldest, easily the most profitable, surely the most vicious. It is the only one international in scope. It is the only one in which the profits are reckoned in dollars and the losses in lives"---Maj. Gen. Smedley Butler