If you do enough volume anything is negotiable. I have been able to get a reduced rate due to monthyl volume. But if you do 10 contracts a month I do not think you will get much of a break. as for what kind of volume woudl lead to a break in commissions, it all depends on ToS so just ask them but only do so if you are really trading more than 1 contract lots 4 or 5 times a week.