I've had plenty of experience with Linux. It's a fine operating system. But it lacks many crucial commercial applications that makes it unviable for producing many kinds of deliverables to clients.

You want to do graphic design? Or film production? Or photo editing? Or animation? Or 3D rendering for anything from architecture to criminology to television advertising? Or music production? Or even plain accounting? Then you will not be running Linux. Because the tools in commercial use typically require Windows - and sometimes (if you're lucky) MacOS X. The Adobe suite. Autodesk. Avid. Fruityloops. Etc etc etc. (MSOffice cough)

It's not fair. And you could argue there are free tools that perform many of the same tasks. Blender, GIMP, Inkscape, Ardour, LibreOffice, etc etc etc. All fine tools. That no one in the commercial world uses.

So if you want to sell your work, you use what your clients use. Or you go hungry.