Back in June when the s first started hitting the fan for me, I decided I needed to sell the house. I contacted a RealtorTM, and a week later this lady comes out with 300 pages of sales comps for the neighborhood. She went through the house pointing out the obvious ("paint this room, replace the carpet..."), then told me to call her once the changes were made. So I spent a ton of money inside and outside the house, including the new roof. Circumstances change, I decided to keep my humble tractshack. But in three months this lady never called back. No follow-up, no e-mail, not even a postcard.
My #1 rule in sales and marketing is if a potential customer initiates the contact, you should treat that lead as manna. They want action, and even if they don't act now they may in the future. So you build up a database and contact them with new offers until they either buy or tell you to bug off. This isn't rocket science.
Based on my limited experience with this one RealtorTM, I am not sure why I should sacrifice 6% of my profit from the sale of the house. She didn't strike me as being much of a salesperson, but she sure does like to use that printer of hers.