"Linux isn't very popular on the desktop. It's a far third
behind OS X, which is a very far second behind Windows. Most people
cite pre-installed operating systems as the reason. But as a
student of psychology, I see something most people don't. There's
one big factor in why Linux isn't popular on the desktop. Linux is
free. I know this sounds like complete dog's bollocks, but hear me
out before judging my sanity.
"We can all remember the story of Tom Sawyer. At one point, Tom
had to whitewash a fence. When one of his friends happened along,
Tom tried to persuade and bribe the friend to help him. Needless to
say, it didn't work..."