And how would/could you enforce that?!
Easy to enforce. Just tag the purchase with a driver's license or other personal ID number, then if someone else tries to load SL or other OS on their computer either via theft or purchase from an original purchaser, they have to report it to Apple via web or phone call and if no ID shows up, then they need to provide proof to Apple of purchase from an Apple store, else, they would be denied the ability to load it. This would be restricted via online verification, which apparently many do not like, but has crucial revenue protecting value.
Agree with the OP, I think the EULA is intended by Apple to cover itself. Don't forget that the EULA is an agreement, not a law, so no police on your doorstep. It's probably not even theft if you're sued.
Although your agreement is appreciated, you likely will be asked to provide proof that no one has ever been sued successfully by Apple for violation of the EULA.
But don't come into the forum and get people all shouting about morals. It's tedious.
I am sure it was tedious at times applying electricity (it wasn't discovered really since it was always there, but simply needed to be harnessed) and other fine inventions that we benefit from today.