I appreciate that you remember me from the Wii music thread, but I hope you'll also remember, despite your choice of the word "pimpism", that I gave up fairly quickly in trying to change anyone's mind around here.
You say that it's easier to make a game that you want to play yourself, but I would submit that that is, at most, only part of the story. Working on a minigame collection for the Wii that you have no interest could be quite rewarding and fun if: you get along with the other members of your team; your role in the game represents a meaningful part of the whole; the project manager has clear and concise goals and realistic means of attaining them; the publisher is strongly behind the project in terms of budget and general support; etc. Conversely, working on a hugely hyped, epic PS360 game in a genre you adore but where none of the above is true might be enough to make you question your career choice.
There are simply too many variables. Despite how amazing the game turned out, who knows how upset/infuriated people on the RE4 team were to hear that, for the third time in two years, most to all of their work was being scrapped in favor of another version. And I'll bet that at least someone on the Ravid Rabbits team had a good time, despite being hardcore in his gaming habits. And how many artists are stuck working on "hardcore" gray and brown shooters that would kill to be working on hardcore 2D sprite-based platformers? Who the hell knows, everything we say here is pure speculation, or sweeping generalization.
I will say it's a little insulting to imply that developers can't put their all into a game that they're not into. I'm sure I pimped in the Wii Music thread that I'm a professional musician, and part of the reason I and others get work around town is that we make sure to operate on the highest level no matter what the project. Putting preference before professionalism is a good way to never get hired again. I would think it the same for the game industry.
I would also argue against your statement that the hardcore games are the best, but then we're back into taste territory again.