Vast majority of Ubuntu and Linux users don't pay for support - that's the difference - they have a choice. With Windows there is no choice, just a huge fee going to Microsoft, who are trying desperately to hang onto the lead in the desktop OS market.
You actually do have a choice. If you buy an OEM copy from, say, Newegg, there is no support included. That's part of the reason it is so much cheaper than the retail version.
