PLEX =/= Diablo 3's RMAH. The concepts are so different that they probably shouldn't even be mentioned in the same sentence. No one said PLEX was an RMT killer. There's no such thing because (illegal) RMT will always exist for as long as an online game is running. However, PLEX is demonstrably an RMT deterrent which will drastically reduce the prevalence of RMT bots and their impact on the normal, legal, functioning economy. EVE uses PLEX but they also play whack-a-mole just as much as SE does. There's no magic bullet single solution to defeating RMT.