Well, presumably, you're getting the exact same game, but with PC what you really get is options.
One of those options is, hey! better graphics. All else being equal, wouldn't you want better graphics over worse graphics? I don't see how this is even in contention. Why wouldn't you want better graphics? Sure, you might want other things more, but, like I said, all else being equal...
Another is controls. You don't even have to use keyboard and mouse on PC anymore (I have an XBox 360 controller for mine), but I don't think I've ever seen an XBox with a keyboard and mouse. Options.
And then, of course, modding. Modding is leaps and bounds more supported on PC than console. This tends to be either an "automatic get PC version" or "couldn't give two shaking rocks" issue for people. But, once again, options.
Consoles by their very nature tend to restrict the availability of options. The OUYA is trying to tout itself as the hacker's console, but with its "every game is free-to-play" stance, most those games are going to rely primarily on micro-transactions, so most those games are going to lock down the modding (and, therefore, the options).
And information wants to be free (or some other hippy crap like that).
Edit: Oh, and sales. While console players complain about spending $50 for a new copy of a game 3 years after release, I bought that same game for $20 the first summer after it was released.