Uh...charge for excess cancel orders...do it a way that is fair and compromising.
So simple, yet "so far away" (a take from the "Carpenters"... so close, yet so far away")
Duffy is such a F...ker. He won't do it.
What do "excess" cancel orders have to do with tiered infrastructure pricing? Supply and demand, my friend. I assure you, i could flood the market with cancel orders from the other side of the globe, and I could spoof with retail-level latencies (I'd have to go about it differently). I live on the west coast, would it be reasonable for me to demand that people living in Chicago should have to slow down to accommodate my trading?