Even in this rather strong seller market there are properties that need a little push to get them sold. Developers feel that incentifising agents with higher commissions or other bonuses will make agents lead you to these properties. Personally I'm not so sure this works. I've always taken the position it is better to simply lower the asking price or provide the incentives directly to the buyer.
What do we do you ask? We give any incentives offered by developers back to our clients. Simple.