Having used the default market window for a few days...
The "Take All Coin" button is how you get the coin from what you have sold, atleast with the default it did not automatically move it to your character. So when you had coin waiting for you from sales, clicking this button moved it to inventory. Not sure if thats how its working on Fetish cause umm... well I haven't sold anything yet today
I will post additions when I am able to test it!