In my case, I sell my own software. So having a market that will buy my software is first priority. Providing support all day is not how I prefer to make a living. (that's fearful me talking)
I'd love to know the percentages of independent Windows devs that make a living selling software vs percentage of Linux devs that can make a living selling software. Sure, big companies will employ both, but how does it work out for the small guys?
Edit: I will admit Linux and its ecosystem are looking more and more attractive all the time...