I understand that people like you attack anyone you deem "overly supportive" of Apple, but you'll just have to accept that we don't all have a copy of your little rulebook that specifies what is and is not permissable (sort of like a religion).
In answer to your original question, yes, Psystar is obviously a threat. Imagine that you had created something valuable enough that other people wanted to steal it. A few isolated thefts and legal imitations happen. No big deal, you think, that's just the cost of doing business. Then someone sets up a company whose entire business plan revolves around stealing your creation. Now you have a problem that actually needs to be dealt with. That's where Apple is at with Psystar.
You said you wondered how many people had ever even heard of Psystar. Probably very few potential customers have heard of them but you can be damn sure everyone in or interesting in getting into the PC manufacturing business is following this pretty closely. Psystar is hardly the first company to come up with the idea of selling Mac clones. If Psystar pulls it off, lots of others will follow.
Hell, it's a great business plan: you don't have to develop any hardware or software. You just buy commodity PC parts, slap OS X on the machines and undercut Apple's prices. And undercutting Apple would be child's play because they're covering all the R&D costs. Anyway, my point is that Mac cloning is a very attractive business and you would be hard pressed to make that case that there would not be a flood of Psystars if Apple does nothing.