Insurance brokers taking extra?

[Francis Rusnak]

Have a homeowner insurance broker who is quoting us for our flips and rentals and he's giving good rates; better than what we have currently.

My fear is he is able to maneuver the rates so they look like a good discount now then when we get new properties the savings will quickly dwindle. 

Can brokers adjust the rates and pay themselves extra with lost savings? Ex. If they get a quote of $500 from Company A can they charge us/the consumer $600 and pocket the annual $100 difference? Or, is their cut only given directly with the original company?