And if Microsoft attempted to adopt that strategy it would be jumped on by every anti-competitive body under the sun, so how come it's OK for Apple? I would love to see the part of Apple's EULA about only running OS X on Apple branded hardware tested in an EU court. I somehow doubt it would be enforceable.
I don't have a hackintosh and don't intend to make one as I'm happy with my real Mac, but on the other hand I don't see why someone who buys a legal copy of OS X shouldn't run it on whatever hardware they want, with the proviso that Apple are not obliged to support it, but certainly should not seek to deliberately break it. If it's just to piss people off who want a netbook when Apple don't deign to make one, that would be disgraceful. If there are sound technical reasons for it, then that would be acceptable. Since no-one knows the real reason, we will just have to choose which we think is more likely.