Most apps on Mac worth buying are either cross-platform (like Word) or a replacement for something on Windows (Pixelmator Pro, which you could argue is a replac

Most apps on Mac worth buying are either cross-platform (like Word) or a replacement for something on Windows (Pixelmator Pro, which you could argue is a replacement for several Windows-only paint apps for Windows, including MS Paint itself and Corel Paint Shop Pro). I think that some of the reasons are Mac's smaller market share (so it's harder to recoup your time spent making the app), and the fact that you have to learn a new language (Swift) or at least use a user-unfriendly IDE (XCode) to ship an app (meanwhile you can make an app that's cross-platform between Windows and Linux using GTK or Qt with relative ease).