We sold our home in October. Our realtor screwed up, cost us money, and in then end we almost lost the buyer. We ended up using the officer manager in our realtor's office to close the deal. They wouldn't even give us the tiniest of breaks on the rate when we requested compensation.
I guess $500 bucks was more important to them than my future business or having me trash them to anyone and everyone I know who is buying and/or selling. We ended up using a new realtor and different company for buying our new place.
My point? I don't think you're going to get a break---especially with this new $15,000 tax credit looking like a done deal.