Well that or they were reading the "how to" on duping stuff in the game they figured "why run dungeons when we can just sit here at the bank and dupe stuff all day".
I have seen a definite decrease. Still work to be done, but I definitely appreciate what's been done so far
Although, I think they are getting sneaky. I swear I saw one in a public dungeon (typical asoihao name), but "properly" geared with a helmet and all. I almost didn't notice him thinking him another player. But then the name lol.