So, I finally gathered enough bones for a purchase at Skarven Bloodhorn.
I accidentally clicked the wrong item and my cursor changed into the item. It was a single left-click. I clicked again because I didn’t want the item, Apparently that counted as an instant buy followed by an instant sale. Now I’m down 13,500 bones. Why is this happening? The tooltip tells me to shift-right click to buy and I didn’t expect a single left-click to do so as well and waste all the bones I played for so far.