@Angus Glashier: While you are correct that capitalism is about making money (that’s why it’s called capital-ism: see http://en.wiktionary.org/wiki/capital#Noun), you are incorrect in saying that serious money cannot be made in selling free software (e.g.: software released under the GPL). How do you explain Red Hat’s success? Yes, it is less common for a successful company to be successful due to free software due to the freedom to redistribute the software. However, that doesn’t mean it’s not possible.
Here’s a hypothetical for you: Let’s say Internet Explorer wasn’t freely available from Microsoft (pre-installed, whatnot). You’re walking through your local computer shop, and you see IE CDs. Right next to those, you see Firefox CDs. (Yes, they exist: http://store.mozilla.org/product.php?code=MZ9008) Which would you pick? Sure, you could just opt to download Firefox at no cost online, but what if Mozilla didn’t offer it for download at no cost? Most people don’t know how to compile source code, and I’d venture to say that most people would trust an official release directly from Mozilla over a binary on a P2P site.
Of course, this assumes you’re using Microsoft Windows, because if you were using a free operating system, then you could just install Firefox (or a derivative) via a built-in package manager from a remote repository. I never claimed hypotheticals were perfect.