Then 849 is less than 1000 (250 * 4),
In my case it was more, it bought for 1050 f.e. , while i explicitly put in buy offer for 250 ea for 4. I get 4, but it took 1050 from me. (original offer was more than 4, but i aborted)
Why did it take that 50 gp extra while it only gave me 4 as i asked for 250 ea ?