Honestly, I don't think it should happen now, but once DayZ: SA has customizable servers JSP should get one, and make a safezone area for trading. (No killing in that zone) I would use it a lot, and I think if other DayZers knew too, they would as well. Infact I know A LOT of people who play DayZ and I would definately recommend JSP to them for the trading area.

A dedicated subforum/trade forum for DayZ is already being suggested here: Dayz Mod And Standalone Subs

And regarding the server part; I think that will just require of someone to take initiative to host one. However, since the game isn't even in beta and still has no release date or deadline horizon, it's way too early for me regarding the server.

Remember to add a poll so people can vote for your suggestion. I'd also recommend you check this: How To Post A Site Suggestion