For Premium Members, have the ability to sell your buildings and/or vehicles back in game at a percentage of their cost.
As the game adds features, the way the game is played has changed dramatically, sometimes making your current setup obsolete.
This is simply getting credits for disposing of a vehicle or building. It is not a recommendation for a Used Market.
It would be under Premium Membership to entice coin purchase for a good benefit. Freeloading this option doesn't make much sense.