[kyriakos]

I guess #3 is the most important factor here but from my personal experience #2 is not really true. Maybe it is for US based web developers but its not a worldwide phenomenon. There is a large percentage using OS X but it's small compared to the combined Windows/Linux user base. I'm sitting in an office with 6 webdevs right now and only 1 of us uses OS X. It not because OS X lacks something but its mostly because Apple product availability, pricing and familiarity is not the same everywhere.

About #1, totally agree there is more piracy on Windows than OS X but I am not sure it makes a difference in the number of sales. i.e. a lot of people will pirate it but isn't that the ones that would have not paid for it in the first place?