The problem with this idea is that the economy is user controlled, no matter what kind of choke-hold they put on decreasing NPC's buying amounts the players will decide how much they want for something they farm/craft/re-sell.

Like many have said before, the have's will have a nice pillow of money while they have-nots will have no way to make enough to compete from the launch.. it will be like FFXI all over again right after international release Rise Of Zilart..