Wait, wait... how many people suggesting this? A few? Right? Because I can see only 2 pages in this thread and probably that's a 0.1% from the server who want such thing.
Who will gonna join this market server, since everyone is in Server 3 or 4. In my opinion there is no person who would stay in one server just to market. Most players want to PK, Trade and AFK in only one place (server) without exiting the game.
It's just like you want to suggest market map for devias, but most players would stay at lorencia or noria.
If we will create market server, we should disable trading in Server 1,2,3,4 and 5 and allow them only to trade in server 6 (market server for example), but I already said "players want to PK, Trade and AFK in only one place (server) without exiting the game".
In result I can only see unhappy players.
We will add soon new PVP server since server 3 & 4 are most times on full capacity.