You know, by that logic anybody developing an application for a single operating system is being a fool. And yet: most of the applications I use on OS X are developed exclusively for my operating system. See: anything Panic has ever made. See: Delicious Library. And they're obviously made by developers that love my system, and they're making their developers a ton of money, so why should they bother porting it over?

Considering Hacker News talks a lot about appealing to a niche rather than trying to appeal to everybody, I find this comment a little irritating.