My point is that Linux users are willing to pay for games, if they know about them.
To play devil's advocate - Linux users may pay more for the Indie Bundles, but there are only a few tens of thousand Linux users paying anything at all. The proportion of Linux users who buy the Humble Bundle is probably much much higher than the proportion who would buy a AAA game (for a number of obvious reasons). Games like CoD need to sell at least hundreds of thousands of copies for it to be worth the support costs.
I don't think it would hurt the game industry to do more projects which cost less than $50 million to produce, and sell for less than $60. Deer Hunter and Barbie type games (accounting for a huge proportion of US sales) sell for more like $20. And iOS games sell for more like $1-$5. But for some reason the latter causes people to ask where they can find the opportunities more than to sit around complaining about how iOS users are cheap and their data doesn't count because they aren't paying $60.