larger (proven) market share is my guess. I have no stats on that by the way, it's a pure guess. The closest thing I ahve is I looked at the humble bundle stats, and scrolled down to the first games bundle which is :
http://support.humblebundle.com/customer/portal/attachments/...
Looking at the graph, I can't differenciate between mac and linux on it, but the next one (humble indie bundle 9): http://support.humblebundle.com/customer/portal/attachments/...
the mac purchases are more substantial than the linux ones. This could be due to any number of factors, but like I said, it's only a guess.
Well, sure, but I don't see what that proves. Game developers find a lot of hacks to work around bad software if there's a market.
Well, I see a lot of developers bitching about how hard it is to port stuff for Linux, but I don't recall so much bad mouthing when it came to porting stuff for Mac in the first place.
A friend of mine works on ports for both platforms, and he vastly prefers the graphics driver situation on Linux, both in terms of driver quality and vendor support.
Funny, they still do get a lot more game ports than Linux so far (while Linux is progressively getting there).