Oh, you mean doors large enough to keep out planes. I see.

Since every Mac is sold with a MacOS license, and you can only install a boxed copy of MacOS on a Mac, it follows that all boxed copies of MacOS are, in fact, only licenced for upgrades. We therefore don't know what would be the price of a full MacOS license, but as is the current industry practice, it should be greater than the upgrade price.

So in essence, Psystar is depriving Apple of the difference between the full and upgrade license prices.
And still, that says nothing of other damages related to their business model, but that's entirely another discussion.

Don't like Apple's business model? Don't give them your business; stop using their products altogether, it's not like they're a monopoly and you're forced to.

Yes, it's the right way. Rooting for someone you like has very little to do with the legal merits of their arguments, which may or may not have anything to do with the rightfulness of their cause, the benefits they bring to society and so on. Not in the current legal system anyway.