It's a collection of things. You are very clearly an "us and them" kind of PC gamer. I've seen your whinges about how consoles are ruining everything, and it's very clear you get a sense of superiority over "console gamers" being a PC gamer. Your issues with consoles stem from you being a PC gamer, not because you actually have an issue with the consoles.
Not at all, I dislike consoles because of the casual elements they are trying to bring into gaming, same as I hate iOS and tablet mini games. I like the PS3 and Xbox 360 (Xbox ONE is a joke though, and goes to show that people will take it up the ass out of fanboyism). Another reason I dislike consoles is that whilst they may not be ports, a lot of games come to PC as an afterthought, and we get laggy pieces of crap like Skyrim that take several months to fix. If Skyrim can run on consoles constantly running 30-40 FPS on the hardware they have, whilst looking 50, 60ish % as a good, why do PCs with 10x the power get 40% better graphics at the cost of worse performance? Skyrims just an example but there are plenty that are like that. Consoles hinder PC gamers in more ways than one, and that's why I dislike them. Although like I said, it's mainly the phone/tablet/Wii generation of 'gamers' I despise.
GPUs aren't used just for games. There are many industries that require a crap load of GPUs from AMD/nVidia that aren't related to games playing.
You can't look at individual GPU sales and equate them being PC gamers.
I know you can't, but they so vastly outsell consoles that even a small % of the sales figures can give consoles a run for their money. Also, each machine is gaming capable regardless of what it's used for, and that would effect the market share % the PC have, whether they are used or not. I know loads of people now who use their 360s for nothing but Netflix, or their PS3 for iPlayer etc. and never game on them. I know the figures are like 10% or less for console owners whereas obviously way more than 10% of PCs aren't gamed on, but the amount of GPUs out there that even if it's just half, they still beat them and if its even less than that PCs will still have a strong market share.
Not to mention that PCs offer a far, far better profit per individual sale that they'd have to sell 2-3 console games to bring the same in from 1 digital PC unit, so whatever the actual figures for gaming PCs vs consoles are, the consoles would have to double or triple the number to match the revenue which is a hard feat. You could have course argue that Steam sales etc. lessen this impact but consoles have the issue of pre owned games, which are hugely popular and equate to piracy as far as revenue goes.
TBH though, the entire subject is simply too hard to research facts on and limited mostly to speculation.