Does not surprise me at all. Almost every cyber crime forum (Damagelab, exploit.in, Darkode, carder.pro, opensc etc) used Liberty Reserve (LR) to receive payments for malware, credit cards, personal information and other illegal content. This used LR because the payments could not be reversed and because the company did not comply with law enforcement.

Not to worry though, Bitcoin seems to be getting more and more popular among these forums and will probably take over.