im a pc gamer, i have a ps3 but i choose my pc over the ps3, whenever possible. i think the first issue is price. if you have a bare bones pc or just a laptop that isnt meant for hardcore gaming, you could be looking at of $1,000 to play modern and upcoming pc games on the max setting (maybe there are pc gamers who are fine playing on minimum, but i refuse to play any games below the maximum setting). its an investment i think is worth it, if youre a serious gamer, because if kept upgraded the games will look just as good as any console game and can potentially even look and run significantly better. besides, i dont care what anyone says, playing an fps just feels infinitely more natural on a pc. but again, to keep up to date, you will need to keep upgrading. once you have the machine though, upkeep is pretty minimal. ill spend maybe like $500 every 2 or 3 years.
another issue is that a lot of people just dont know that much about pcs. im not gonna pretend to be a computer expert either, so im not trying to call console gamers stupid or anything like that. its just that some people dont know what parts they need for a badass gaming rig because if your not a pc gamer, you probably havent built your own computer and just bought one from bestbuy or microcenter or something, because if you dont pc game, theres not a lot of reason to build your own pc. but even people who know which video card is the most powerful or how to water cool their system, a lot of people are scared off by pc gaming because of the blue screen of death. truth is, that will probably only be an issue if you dont know what your doing.
another issue is that pc gamers can be intimidating sometimes. i had a friend who asked a pc question on a gaming forum and a lot of the pc gamers there kept talking down to him and making him feel stupid because he didnt know much about computers. theres a sort of arrogance that some (emphasis on some) pc gamers have, possibly in part due to the fact that pc gaming has been significantly overshadowed by consoles, and some pc gamers may be a little bitter about that(i mean, the fuckin gamecube section, at my local gamestop, is bigger than the pc games section...thats just wrong)