[wladimir]

1) I don't know about Mac, but most windows users I know pirated a lot of their software. Isn't that just as tight-fisted?

2) There is not much commercial software for sale for Linux at all, so I guess there is a chicken and egg problem.

3) Of course you will sell less Linux copies of a piece of software. There are less Linux users.

But to say Linux users are comparatively tight-fisted compared to users of other OSes, I'm not sure how you come up with that, Personnally, I'd buy a lot more games if they simply worked in Ubuntu... And if iTunes worked on Linux I'd buy more music there.