Why, so you can go back to upgrading hardware to the latest and greatest every 6-12 months (and thats being conservative with time, its usually much shorter). With a console you are usually safe hardware wise for 6 years.
No thanks, I'll take upgrading every 6 years to play the latest and greatest games, not every 6 months.
That's funny, you don't upgrade consoles but in 4-5 years you are stuck with outdated games with crummy graphics and running at 1280x720 which is barely a step-up from 1024x768 just dying for the next gen to start.
On a PC you can upgrade on a 2 year basis and get the best graphics there are no "next-gen" the platform is constantly evolving, it's pretty great, $1000 can get you a great PC with a nice 1680x1050 monitor, if you spend $400-$500 more in the span of 4 years you can keep your games on the fullest settings. That's a total investment of $1400-$1500 including a 1680x1050 monitor and that's could even be lowered.
A console costs about $250-$400 but games cost more ($10 more for new releases), go down in price at a lesser rate, have expensive accesories, in the case of the 360 an online subscription ($50 a year for 4-5 years, $200-$250) and a nice HDTV which should run you maybe $1000 and still only runs games at 1280x720 (it will have 1080p probably but no console can render graphics at such a high res except for a bunch of games). We are looking at more than $1400-$1500, sure you don't NEED an HDTV, but then again you barely need a $400-500 PC to run even the latest games at standard definition TV's resolution.
PCs are everything but I won't take the price argument anymore, you can say they are hard to use, hard to build, don't have as many good games, have buggy games, require you to keep yourself informed or whatever but they are not overpriced as a gaming platform and any console gamer out there can afford a gaming PC, they just don't know it.
BTW I'm not saying you have to like to PC gaming and have to switch right away, I'm just saying, if price is going to be an argument not to get a gaming PC then you might as well just shut up.