As I mentioned in another thread on this subject... what you all are asking for flies in the face of 'realism' within the game world. There is no electricity, no internet, no 'Amazon' in ancient Tamriel- yet- you want to have a system that basically defies logic simply for 'convenience' because you don't want to actually have to do what people did before electricity, internet and 'Amazon'- and that's actually go from store to store and check for items directly.
In DCUO, they had a marketplace, but it fit within a game that consisted of advanced technology. In ESO, we have magic, but not sure how a 'magical marketplace' would fit within those 'realistic' parameters.
So as much as it would be more convenient to have a connected marketplace, in order to continue the sense of immersion and RPG environment within ESO, I'm opposed to it.