there will be 3rd party sites that support item selling so people can avoid the blizzard cut. it is a real fine line blizzard. doesn't want 3rd party sites selling the items, but if they take to much of a cut it will push more people to the black market. if there is a need a site will pop up.
like jsp back in the d2 days. it was basically a d2 auction house. made item trading so much easier