So the two situations are really not comparable. I still think the main difference is that you have to install Linux yourself. It's not even that installing is difficult--it isn't!--it's that normal people don't even realize it's an option. Your average random laptop buyer who just spent $600 on a laptop from Staples would be able to use Linux perfectly well if that's what his laptop came with--I suspect some wouldn't even realize it wasn't just a different version of Windows. But since his laptop invariably came with Windows, that's what he's going to use, not for any reason but inertia.