I think that the main reason people buy consoles is because to get a PC which is quiet and can run the top games, you do need to spend a fair but more. Mouse and keyboard will be te biggest deal breaker for most.
I like to think of pcs like drugs (I'm not in any way encouraging drugs, it is merely an analogy. Also, I am in no way shape or form saying that OcUK deals drugs!)
You have something which is mediocre, basically a supped up office PC. this is sniffing glue.
You then get your first "custom built" computer, often a dell as they're so widely known. You have the stepping stone for the harder stuff, do your new XPS is cannabis.
Then you get an addiction and you want more power so you stray into building your own, or getting a proper custom built, extacy. This also puts you I touch with the dealers (OcUK)
Finally, you realise how much power you can have and you decide to go completely OTT and get a ridiculously over powered computer which ruins your social life, cripples you mentally and physically and makes you whire yourself out to strangers (many many ways to do this) in order to fund exquisite motherboard cooling.
You are now on PC cocaine.
Sorry, I think I may have gone slightly off topic, but the general point is people start of with a game they get for free on PC and I think form then on they gradually progress up the PC drug hierarchy until they start hating consoles, and it all starts of with simethig like TF2