You obviously dont know wtf you are talking about so we all know to just flat out ignore everything you say.
We need the EM so free players can earn ecash (subsidized technically free rps) by selling items/crones/characters inside the game. Just like is on global, trading IM goods in game just wont work because at the end of year 1 that spirit stone will cost 150 million and by year 2 it will be 1 billion crones. Crones in this game are not regulated and the broken tsb system which will churn out over 2 billion crones a week (thats 104 billion crones a year) and thats not even factoring in what having a fleet of afk farming bots/hks will get in crone drops alone.
Have you ever played global? there is a reason EM crones are capped at 10m now if it wasnt 1 billion crones would cost 100 rps.
Also tera does have tradable IM goods the part that you didnt get out of it is that THE ECONOMY SCALES PROPERLY!