I'm interested to know what are commissions cost like on daily trading basis for full time traders out there. For past two months, I have been trading with IB with 100k account. I spend around $400-$600 on average daily. I trade stocks only. Do IB offer better commissions for high volume traders? Are there any other brokers have cheaper commissions (for stocks) and have same or better execution speed than IB? Who you guys trade with and what's the commissions cost like?