I have the feeling that there are just two real people behind all the spammers, since there are only 2 things being advertised, as you said.
lllopaz and
charrr.....something look familiar. So I take my words back: I saw 2 other spammers other than
rumparee. But there are more that I (luckily) didn't notice.
EDIT: I just remembered someone whos User Name was
NotASpammer. Funnily enough he didn't have a signature...