If china was only able to sell to china and someone from any other country went and bought "X" amount of "Y" good and then they go and sell it in their home country for a 75% profit what happens? The prices in china (that can ONLY SELL THE THIS CHINESE) go up to the lowest common denominator (being the highest priced country). Hurting china immensely by not being able to sell directly to that/those countries.
Let the sellers themselves put it up on those servers so the middle men get 0% cut or restrict the markets. If pooling the markets so it is just one MB is not possible right now due to technical limitations then it needs to go back to restricted per server because this is insane.
Copied from another post I made but sums it up pretty well as to why it is a bad why to go about trying to balance out markets.