My suggestion is to talk to more business brokers about this. Some are more expensive than others and some are worth the money they get because you end up with a much better deal. Be cautious of course, that's always a good idea, but talk to several.
If you assume you pay 6% for a business broker, then if you get more than 7% more by going through a broker, you're better off. Just make sure you're working with a professional. Get references of past deals, happy sellers, and call them. Check the broker out well.