Like I said in a comment to a previous suggestion, I don't think money laundering will ever work unless the server develops a way to distinguish between "legal/clean money" and "dirty money".
@Bodges has a really good idea regarding this.
End of the day though, aside from bi-weekly flat rate taxes, no one wants to report any sort of income or do document rp. I tried it before 3 years ago and it wasn't very popular at all.