Well, its pretty simple:
If a man is willing to lie (AROS support), bully (lawsuit threats) and steal (copyright infringement), odds are he won't have your best interests in mind elsewhere either.
So why should I give him money?
What if the PC turns out to be dodgy components or otherwise defective?
What if I receive a pirated OEM copy of windows with it?
Are there any reason whatsoever to buy from this guy ?