Worst case scenario about this is we would have some bad eggs who would still spam the zone chat like merchants. But of course if you've added the ability to turn off world + trade chat, then I guess I'll just deal with it.
If you're able to come up with a User Interface on the glorious Energy Market, I don't see what's so difficult about an Auction House like feature.
Also, your folks down at this thread would love you very much.
http://forums.spiralknights.com/en/node/2043
Thank you. I'll be compiling a future list of ideas soon. I just came on here to give you a friendly reminder.
- Critical
Perhaps this is a temporary solution; an 'auction house' trading mechanism is in progress but this is just for the time being. I sure hope so.