Quote from Dogballoon:
Just a note of caution -- be wary of sub-LLCs claiming to be "firms" who are just middle men for prop firms.
I bet in the long run you will find a way to get very solid income from this service, just be keep abreast of who the dirty ones are that will try to use you as advertising, or pay you to advertise their uncompetitive/shady/dangerous companies.
The hard part will be making sure you actually know who they are, and what products and commissions the reliable firms offer. if you can find a way enhance the competitiveness of this industry without being compromised, you will probably reap some nice rewards.