Don't know if RoM is already implementing this but if not, then I suggest having this system.
From the looks of Erebos' auction house, though, I don't think so.
I stopped playing RoM a few years ago when a mass of players were leaving, and the drop in population back then was pretty evident from the drastic decrease of the amount of stuff being put up in auction. Now when I came back, even with the merges, I think the stuff put up in auction back in those waning days are still more than the stuff being put up in Erebos now.
It's crazy that the number I'm comparing only concerns one server, imagine a server back then even on its waning days has more stuff than all the merged servers of Erebos now.
So I hope you guys can consider this suggestion (again, only if it's not already being implemented). I know there's a concern about economy but I already experienced this cross-server auction house system in another MMO and it seemed to be working well, or at least I haven't heard any complaints from the playerbase.