What? Humble BundLe totally sold out their integrity after they let THQ sell their games with the Humble Bundle brand, without linux versions and with DRM.
I was disappointed about this, too; not because it's necessarily bad, but because they had set the bar so high for themselves and then totally missed it with this. On the bright side, it raised a lot of money for charity.
Their integrity? THQ was about to tank, and they wanted to flip the games to whoever they could.
I'm sure that if there were THQ-internal beta versions for Linux and Mac, they would have happily shipped them.
[1] http://www.penny-arcade.com/report/article/the-humble-thq-bu...
[2] http://arstechnica.com/gaming/2012/11/humble-thq-bundle-thre...