Well, it all depends how you look at it, if webstatistics are anything to go by, Linux has something like 1% of the desktop. That means 1 in a 100 is a Linux-desktop. Have you seen what a 100 desktops are running in the past months ? I know I haven't. Actually, possible not even in years (ok, if I don't count the LUG-meeting I visited). I also know their are a lot of people who are like minded and they use Linux 'together'. So these Linux desktops also are clustered together. That means it's even less likely you'll see a Linux desktop in the wild. I use it every day and I know 5 people who use it atleast a few times a week.