Chein: You are free to question the going rate however that doesn’t change the halachic obligation on the recipient of the service to pay the going rate. If you would like to discuss whethere the going rate is reasonable perhaps that’s for another thread but whatever is the going rate then that is what is owed the shadchan.
Wolf: As i’m sure you well know you anyone deserving of being paid for a service is free to be moichel what is rightfully coming to them.