To back this up... I'm not even sure what the Windows market share is these days, but we'll just say it's still well over 50%, and Apple has 5%, so at least 10 times the users. Out of those users, how many hardcore developers are there? Compared to Apple developers? I'd venture to say there's a lot more Windows people out there that can really understand the inner workings of OSX and how great it's merits are. That still doesn't change marketshare, income per app developed, etc. MOST developers (commercial, not hobby/shareware) are interested in making money by developing software, it's their profession. When you want to make money, you target the largest audience.

I'm not so sure that the masses can't understand the inner workings enough to see the beauty of OSX. I think it's more like "the masses don't care about the inner beauty of operating system design". They probably care more about buying a practical solution to their needs.