Sometimes you need to manually post 100+ things to SELL in a row, and then once you run out of the stuff you accidentally post 180+ BUY at the same price accidentally.
The "sell" button shouldn't disappear when you run out of stuff, it should BECOME GREY so that distracted people posting 100+ things don't accidentally buy what they want to sell PRETTY MUCH 3-4 TIMES A WEEK FOR A LARGE CHUNK OF THEIR INCOME LOST.
The fact you can't take your own deals only adds to the frustration