I, for one, would be more than happy to pay Real Money for games ported to Linux. Just as I would be expected to pay Real Money for games developed for Windows. In fact, I would be more than happy to pay money for Linux games.
Now, if developers could just get past their first-person shooter fixation, all would be well. I enjoy them as much as the next person (almost), and am currently looking for a copy of Descent 3, but seriously. There should be more adventure games. Or at least more RPGs. And definitely ports of all the Myst games.
This is brought to you by the fact that Ardith's NVIDIA card is currently playing happily with X.Org, the fact that she doesn't want to reinstall Windows any more, and the number 7.