I too support Linux with my business, while I'm only one man, I understand that people really don't care! Those who know enough about Windows/Mac to know which one they need, are quite happy paying more money to play games or have the applications that they are after, but as for the more common users, email, web, word processing etc, if you can save them time, money or inconvenience they'll take that option everytime!

The whole Windows vs Linux vs Mac is a very touchy issue, but at the end of the day, it doesn't really matter, and most people don't care too much.