Why hasn't someone come up with an unlimited commission structure yet? Pay $5000/month and trade as much as you want. Does it really cost IB/Tradestation a materially higher amount of money when you trade 1.5M shares a month versus 1.0M shares? Why haven't commissions continued to fall? IB has been charging the same fees for years but it seems to me that the cost of providing those trades continues to fall (price of servers is cheaper, price of technology is cheaper etc etc etc)!