But can you SELL anything you write for Linux? (Score 1)

OK, I buy the argument that if you're developing for Windows, use Windows, and if you're developing for Linux, use Linux. So you're an ISV - you have decided that your organization will write programs and sell them. NOW why would you develop on Linux? Correct me if I've suddenly gone all loony, but is there anyone on the planet that's actually MAKING any MONEY by SELLING applications or even tools that work on Linux? The early adopters (Corel, Oracle) aren't making any money SELLING software for Linux. Is anyone? Can anyone? Or is Linux all about "write everything yourself that you can't get for free"? Because if it is, isn't it doomed to financial failure as a platform, regardless of how "cool" it is?