I don't see anything wrong with taking money for linux software at all. I would pay for linux if I had to. Windows XP is great, but I hate Microsoft because of the way they constantly make me jump through hoops to prove that I legally own my copy(ies) of their operating system. It pisses me off and I would love to be rid of them forever but unfortunately, any software worth a runny shit is written for windows.

~ Edit ~
And please, if somebody mentions FireFox I'll go insane and hang myself from my ceiling fan. It's a big bloated piece of garbage now too.