Well it took three goes and increasingly blunt requests but I finally have a definitive response from MySpace.
Hello Mr. Hamilton,
MySpace does not cooperate or aid spammers in identifying currently active user profiles.
I am still suspicious. I doubt that I shall be using MySpace any longer anyway. But I shall be keeping that response on file just in case they are finally caught out. And for what it's worth, I would suggest being even more careful with what you may post on your MySpace account. Something stinks here worse than my socks in summer (and that's a lot).