I'm looking for opinions on fair Broker fees to charge.
I'm an Independent Broker in California doing mostly Commercial P&C, but occasionally touching on Personal Lines. Over the last few years, I've chosen not to charge Broker Fees. Currently, i'm re-thinking that strategy because it takes a lot more work (and money) for a Broker to shop 10 carriers than my captive counterparts shopping 1.
Some of my colleagues charge a flat 10% on everything, others charge $100 - $350. I recognize that the fee should reflect the premium (Not charge $300 broker fee on a $500 premium), and that some of my appointments don't allow them at all.
Any feedback from the community would be great.

Thanks in advance for your time.
~Surfer Ken~