They probably aren't that different on paper, but when you start factoring reality into the equation I think it's hard to deny that comics and sports simply are not on the same level. Cities don't invest millions upon millions of dollars to build comic book stores. There is no massive network contracts going to Marvel and DC. Nothing the comic world produced rivals ESPN, VERSUS, The GOLF Channel, NFL Network, MLB Network and SPEED. Also, despite the protests from the Real Life Superhero community, you can't go play a pick up game of Batman with your friends -- I mean, I suppose you could in theory, but most of what exists in comics cannot be replicated in reality whereas EVERYTHING in sports can be done as long as you practice at it (maybe not at a professional level, but fundamentally it's all the same). I also think because athletes are real people, and they compete in reality, it also in some sense separates them from comic books. Batman vs the Hulk isn't determined by a bunch of concrete statistics, whereas the greatness of players like Tom Brady, Michael Jordan, Peyton Manning, Albert Pujols are very real things determined by very real acheivements. Sports also provide a healthy outlet for competitiveness and risk taking, and while it's unfair to stereotype comic readers as basement dwellers I also wouldn't say they are the bastion of manliness, competition and risk-taking. Moreover, while the internet provides an atmosphere for nerds to debate, it's on a much more insulated playing field. I've gotten in some heated debates here, but I've never pulled a hammy berating someone for denying the greatness of Cyclops.