Many domain investors who have taken to outbounding domain names are providing an Afternic checkout link and only paying 5% commission. There are other solutions to use from Efty, Atom and Sedo just to name a few.
Jeff Gabriel let me know that
Saw.com will also charge just 5% if you have done outbound and brought the buyer with an agreed upon deal you can
contact Saw.com and get a reduced rate. Saw.com charges 9% for self-broker or by utilizing their award-winning domain brokerage service you pay 15%.
So now if you outbound you have another option when you bring the buyer. You have the added benefit that if the deal gets stuck you can turn it over to a seasoned domain broker by letting them know you need their help. If you do that the commission will be 15%.