Maybe people don't list rates because not everyone fits in the same box. Some people are more active than others. Better to speak to a broker and tell them what you are looking to do and what markets you want to trade. Then let them give you the rates. Not everything is so cut and dried. Some exchanges charge brokers more for execution and clearing. Doesn't mean the broker is trying to be sneaky or wanting to do a sales pitch. Just my 2 cents.