Do you really think big union like GW will keep trade after limit? 60% reduced gold won't make good geared people to keep jobbing after they finish up their limit but getting extra honor points might work.
Also i'm trading since g.o and i'm lvl 4 rank atm 6 on the top traders list,comparing to a guy who switched 2 weeks ago to thief and he is already 10 lvl which gives better stats than premium i call it GOD buff even with low gears you can tank 5 ppl on your ass with proper healings as eu.
Nerfing thief EP per trade will makes all thieves crying around,which they have right since they're playing for ep as well,buffing trader/hunter exp or even making job rank buff 4-5 as thief lvl 10 would be bazinga so hunters / traders are actually able to fight against that full bard party of thieves.
Greetz