Well, piracy is of course a big one. You can't make a big budget PC game anymore, at least not like you used to. Online focus helps, but not every game is online focused. Consistent hardware is nice for the developer, of course.

Mostly, I just don't like sitting at a computer as much as I do sitting in front of my TV on my couch - makes a world of difference.

Now, there's a lot of common-denominator games on consoles, that's true. It's like the Mac in that regard - if you have special needs you're less likely to be catered for. On the flip-side, interface complexity is absolutely not a requirement for depth - and there's plenty of deep games. Of course, the definitive full mech sim is actually a console game - but Steel Battalion comes with it's own controller with hundreds of buttons, so it's kind of a special case.