Palm made iTunes think the Pre is an iPod, so I'm guessing it probably won't be all that tough for Prystar to fool OS X...at least until Apple releases a patch to fix it.
There is one enormous difference between Palm and Psystar. To see the difference, you have to read the license for the iTunes application, and the license for using the iTunes Music Store, just to be sure, and the license for MacOS X. Palm doesn't make any copies of iTunes, and the license for iTunes doesn't seem to mention anything that would make it illegal in the first place to use iTunes with a Palm Pre (it seems to me it might have been illegal to install music with DRM bought from the Apple Store on a Palm Pre, but first, it doesn't work anyway, and second, it doesn't matter much anymore. But the MacOS X license clearly says that copying MacOS X is illegal.
I can imagine that Apple isn't happy about what Palm is doing, but to prevent it, they would have had to take some legal measures earlier, exactly as they did with MacOS X.
Firstly, these are in no way meant to come across as flame-bait, they are genuine queries....
Why is this such a bad thing for apple really? Macs are (seen as) expensive, if 'customer A' cannot afford a mac they aren't going to buy one and therefore Apple gets no money. But if they can afford a cheaper machine which does the same job but for less money AND includes a fee for OSX then Apple would surely gain a sale they wouldn't have and be better off?
If enough people did this, would apple not potentially lower their prices accordingly, which would be better for us, the consumer?
From Apple's point of view, it seems you answered your own question. If anyone in the world does anything that forces Apple to lower their prices, whether legal or illegal, then this is very obviously a bad thing for Apple, really.
But what you really have to keep in mind is how competition works: There are dozens of big computer manufacturers in the world, all competing, all in their own way. Each of them tries to find its own way of competing. Dell for example tries to compete by building the worlds most efficient supply chain, getting the cheapest suppliers, building highly configurable computers and selling them directly without giving money away to resellers. Apple competes in a completely different way: Apple paid $400 million for NeXT and with that it got the first version of MacOS X; then it spent hundreds of hundreds of millions of dollars to improve that operating system.
Dell's strategy gives Dell certain advantages over Apple, just as Apple's strategy gives Apple certain advantages over Dell. This is Dell's and Apple's choice; obviously Apple could have done what Dell did, and Dell had enough money back in 2000 or 2001 or so to outbid Apple on the NeXT sale. But the important thing is: Competition only works when there are laws that protect the competing companies. For example, copyright law is there to give people or companies an incentive to create new works; in this case copyright law is what gives Apple the protection that nobody can copy their software except to Apple's conditions and with Apple's permission. Without that protection, you wouldn't have Dell copying MacOS X. You would have a world where Apple would have never created MacOS X.