No competition? Are you nuts? Apple makes PCs. So do HP, Compaq, Toshiba, Dell, Sony, etc. Apple developed Mac OS and decided it didn't want to allow other companies to install it on their hardware. Microsoft developed Windows and decided to license it to hardware-makers. This is the same deal as movie companies selling movies on BD or DVD but saying you can't play them to a big theater audience.
Why has computing made people not understand laws? I had someone this morning try to tell me that because he bought an MP3 it was his and he could do with it whatever he wanted, including giving the files to other people. Just wow.
Well, by your analogy, Apple hasn't licensed the right to put Windows on it's computer, yet it does the same thing Psytar was doing. It created software - bootcamp - to allow Windows to be put on it's computers. I guess I'd have to check the licenses of each, and I'm guessing there's nothing in a single user copy of Windows that says anything about what kind of computer it can be put on minus the hardware specs, but it does make one wonder about the legality of selling someone a product, OSX, and then telling them they have to purchase something else to use it. If I have purchased OSX and can get it to work on a PC, I feel I'm free to do that. And Apple is free to continue to try and break the code, because they never guaranteed it would work on a PC. But I don't feel they have any right to come after me for damages. There are none. So, having the legal right to install it wherever I want would also give someone else the right to sell me software to help me do that. Even if it is illegal for me to do it, it shouldn't be illegal to sell me software that helps me do it. Analogy: I can't buy pot legally or smoke it legally. However, it's perfectly legal to sell bongs, right?
So there may be precedent, but I think there would be a good chance Pystar would win the software case.