Wouldn't make any difference. Copy protection of any form can be cracked easily. Not selling copies doesn't matter as your mac comes with a restore disc which will be posted online for download.
Hackintosh's are easy to build, as you can see other companies are forming to sell this desktops running OSX. Really the only choice for apple is to mount a pile of legal fees fighting all these or offer a midrange tower that people want and lower prices. Or make OSX available for other computers. Until they do that these companies will pop up all over and people will still build hackintosh's.
Yes, true that the encryption is just a roadblock for a determined individual or company. However, it would be in Apple's best interest since someone knowingly breaking encryption is a serious offense legally than someone like Psystar saying that they just bought the retail boxed version in a store and walked out with it.
A hacked OSX image would be illegal from the get-go.