This is one of the biggest issues I have with Mac, and have done for years. It's either impossible or incredibly difficult to produce things for Mac without owning one because of the way Apple have locked down on software and code. They want you to use a Mac, use their software to create and so on.

What it means is that it's only really an option for certain things, like game development, when you've got enough disposable income to be able to produce a version for it, which rules out a lot of small developers.