The fact that a direct trade instance window would be simple to implement is irrelevant...
the people arguing against it are the exact ones exploiting this "feature"
the bottom line is it is that way because they want it that way,stalls are a rip to BOTH parties,end of story.
and my only advice to you is: if you feel cheated by the way they troll via the stalls,
you damn sure better not go buying any books!