Remember if you approach a franchisor and that franchisor uses brokers you should be able to reduce your franchise fee by the price of the commision they would pay to a broker. You have bargaining power before you sign the FA not after!!!!
Moreover always understand who a broker is paid by, insist on disclosure of precisely what they are paid so you fully understand their motivations. If the broker is not willing to put it in writing then move on, you are not losing anything.