For some of the 'with it' generation, to pm a larger number of members isnt hard at all. I just spoke with a young guy I know who enjoys playing with his puters as well as rc. he had a quick look at the set up and told me he could easily do 300-400 pm's an hour on here without going in and figuring how to mass address single pm's. As Rcken has stated, this is an open forum site, and there WILL be those that will try to use the site for thier own agenda as per the clown this thread is relevant to. The only thing I could possibly suggest is maybe add a tab like the report tab here on eash post that will automaticially forward the offending PM and relevant details to the relevant mods or admin.
On the other hand a thread like this also serves as a heads-up to the members here to show all that we have yet another fool misbehaving in cyber space, and to be honest, I still think having a good laugh at them publicly and belittling them is the best way to discourage these losers.