For some reason when you look for the cheapest characters, it wont show you the cheapest ones, usually starting with with about 70 coins.
For example, I'm selling a nelf rogue 70 for 45 coins, and u cant find him unless you search for specifically nelf rogues.
Also the system is really flawed that it forces you to sell your character for a higher price, if you happen to have items that you can buy from the store.
No one will buy a fresh geared rogue for 83 coins just because u have the pvp shoulders and 2-3 pieces of dungeon gear.