"at a non-existent subdomain of Typewire's site"
Surely a non-existent subdomain should return a Name Error?
Unless you explicitly asked for a wildcard subdomain (which I realize the T&Cs _say_ you did, even though you never intended too), then I'd expect ww.realdomain.com and qqq.realdomain.com to return NXDOMAIN.
(and I agree with the post, adding a wildcard domain and putting ads on the parked pages is nasty, insisting it's a core part of your business model when called on it is evil, trying to then claim I'm somehow responsible for the ad content on this pages is beyond stupid! I'd certainly never use a registrar that chose to do that to me.)