The statement that people are less willing to pay for things on the platform is kind of refuted by how the linux demographic always pays almost double what people on osx, and triple what people on windows pay for the humble bundles.
It looks to me like there are some Linux users who don't mind buying games (and do not mind paying premium for that), but the majority is not interested in buying games at all, regardless of the price.
Moreover, my own experience with buying games is that (digital distribution aside) it was practically impossible to get Linux versions of games (well, at least in Czech rep., where I used to live). And if there was a Linux version at all, using it meant buying a box with the Windows version and the patching it. So, even though I use Linux for work, I used to play games almost exclusively in Windows (and then on XBox, which made things even easier).
There's really no need to be so snappy.