I am currently running into an issue selling a character for tokens. The issue is he is in full BiS T7 and Ulduar is out. Understandably, people are not going to spend the money it costs to buy a T7 when they can easily level or buy a toon and gear it out in T8 instead. Because of this I want to offer two suggestions.
Allow sellers to lower the price. There seems to be a minimum set by the forums as to how long you can go on price. Maybe half the cost?
and/or
Change the price on 213 items so they are not equal to the cost of Ulduar gear.
The first suggestion would also help people selling toons with Heirloom gear since the system does not bundle their price like when purchasing them from the store.
the first suggestion has been suggested and denied many times. prices are based off the marketplace cost of the items your character has equipped. only way to lower it is by removing gear.