Since when is Linux making enough money to survive as a business? They get donations. So maybe you should think again.

Probably not quite what you meant, but most of the kernel developers are paid to work on it full time (and by most I mean >90%, last I heard).

Whilst that is not a business in the same sense, there is business around enough to make it worth while.

Novell and Red Hat both are real world corporations, and Ubuntu + others are on their way to joining them. Claiming that linux cannot survive as a business is quite frankly foolish. It exists and thrives in a capitalistic market, and with all due respect, it most certainly can make enough money to survive as a business. Note my comment was not specifying the linux kernel in itself, but rather the larger scope of the OSS and GNU/Linux projects. I welcome any counter-arguments.