Not speaking from direct personal experience, however the Humble Bundles have found that linux users tended to pay more than average, which goes against the common assumption that linux users want everything for free.
Kind of users on Linux and Windows and Mac is different, so same app would have different sales.
Most of Linux users has good computer knowledge therefore some apps like Type-Fu should have bad sales.
Also most of gamers living on windows not Linux...
Can anybody share his sales statistics on Ubuntu Software Center?
