The trade office is now allowing you not only to trade items, but also sell them to the game.
The prices offered may seem low, but selling to 'the market' will still bring some profit.
The maximum amount you can get is LEVEL * 10000, daily.
This limit is per account, and the LEVEL is the level of your highest player.

Example: If your player is level 50, you can get from the market up to 500000 coins, every day.