Where is this "Linux users don't pay for software" idea coming from? I buy software all the time, and I would love it if I could buy products like photo shop and games from steam on Linux. It would essentially keep me from ever having to buy another windows copy again. It's not that I don't like paying for software, I don't like paying for an operating system, nor do I enjoy using windows.
Except for the fact that the n900 uses a resistive screen, as where the Droid uses a capacitave screen. Droid has way more apps available for it. Masses will chose Droid imo.