Regardless if the appraisal expired you're going to have to pay for another.
You choose to work with a low margin broker, you've gotten exactly what you paid for, slow service, limited communication, etc. Why are you surprised? Top notch experienced agents don't get involved in rebates or commission splits with clients; they don't need to; their clients value and are willing to pay for their experience.
If this is a regular sale, perhaps you should consider other options.....