Ditto for the ones that wanted to be successful software shops of any kind. It's not as though the phenomenon of developers failing is somehow special to the Mac.

There are pros and cons to both approaches. With Mac software, you could only reach about a sixth of the total PC user base. With Windows software, most of the users are much less likely to ever find and buy your app. With generic, cross-platform software, you have the advantages of both platforms, but a decent, native-feeling Mac app could probably annihilate you on that front. I'm just saying, the set of sacrifices you chose isn't the only reasonable one. I don't want to scare people away because of it.