It's a strange phenomena. Sell content attached to a charity and the Linux users end up the most charitable on average. I don't think the break down of total payments reflects the install base of Windows, Linux & Mac either.
Why is this?
Why is this?
I would guess that a significant percentage of Linux users that buy the Humble Bundles are developers/scientists. These groups create content themselves and therefore they might value content (and especially DRM-free content) higher than other groups.
It might be really interesting if the Humble Bundlers collected some basic demographics.
Jokes aside, Linux users are by definition more attracted to the concept of community and independence. Hence their support to people who believe in the same things.