Yeah you're right Altmer. Now that I think of it, I'm pretty sure one of them had the Asperger Syndrome.
Autistic people really have twisted minds, take this Richard person as an example; In 'real life', or, while not behind his computer, lots of his thoughts and actions seemed quite retarded to me (eg. the $2 Christmas thing). But, in all weirdness, he still manages to do all this smart and sick things and not get caught for a long, long time. Building websites, gardening, writing sick jokes, using deep wordplay, knowing how to use alts effectively and so on is, to me, not something you'd expect from an autistic person. But like mentioned before there probably are different forms and degrees. Personally, I don't think this Richard person is in the "-60 IQ" category because pulling all of this off surely isn't an easy thing to do. But on the other hand, it's perfectly possible because to his family he seemed like a total retard. Autism is weird.
edit: Yes Mekkah, she's obviously a clever girl for sorting all of this out, but to me her way of "approaching" the suspects (e-mailing Melanie, Richard himself, ...) were pretty damn stupid. Going straight to the point isn't exactly a good thing to do in this kind of situations; the chances it will pay off are slim. And it didn't, seeing the only reaction she got was from the mirrorjoke she made. That would've been a better way to get to know him and to fuck with his mind. But overall the things she did to find him were pretty damn smart.
edit2: On a less serious note, expect me to go rambo on the word "duclod" from now on.