Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

What do brokerage firms do?
You can get direct market access (DMA) but you have to pay for data, as this is part of the exchanges data plan, and there are plenty of other fees that are passed straight down to you. Your clearing firm also has fees that are passed on to you. In general you are looking at $150 a month on the low side, in data and software fees. If you wanted pure access, NASDAQ alone charges $6,000 a month last I checked. The different routes data routes to the exchange all have different rules, and they give you rebates for some kinds of orders in some conditions.  Brokers nowadays usually assume this responsibility (including collecting the rebates lol), at the very least, and charge an average price for routing your orders, a price that fits into their business plan and their target audience. Hope that helps.