The only way you could have a feasible market here is if one day Apple licensed OS X, which is something highly unlikely to happen anytime soon, if at all.
We don't need that kind of market. God forbid. If it were ever to happen, OS X as you know it would cease to exist. You can kiss goodbye most of the reasons for using OS X. It would fast become a Windoze clone.
I'm not saying that's what you want, I'm merely expanding on your comment, if you don't mind.
Licensing out OS X, and Apple giving away their core business in the process, and letting OS X rot out in the open. All because people want it for cheap so they can run it on their hardware-of-the-month. No thanks.
I'd rather pay a bit more once in a while than play with a Windows clone day-in-day out.
It's the problem Windows faces (which will become Apple's problem if OS X is let loose):
MS is trying to compete against a vendor who uses a vertically integrated model rather than a horizontal model which Microsoft and the PC market uses. The result is that you have a poor integrated approach to marketing, hardware and software design where the experience is as much dictated by the hardware vendor as the quality of the operating system - both of which are developed by two separate companies with different goals over all in regards to their respective strategies.