I would not. I would worry that the pool of other people paying for it would be so small that unless the application also worked on Windows or OSX, the develop

I would not. I would worry that the pool of other people paying for it would be so small that unless the application also worked on Windows or OSX, the development team would not be able to sustain itself. Thus, I wouldn't be willing to pay the more substantial cost: spending my time learning to use it and integrate it into my workflows. (This is a big part of the reason I moved to OSX when I left uni.)