It might be different in other parts of the country, but in my pond the extent of the services are: 1) Giving the homeowner a quasi market analysis to establish a listing price; 2) Listing the home in the MLS; 3) Running a single ad with picture in the local paper; 4) Having an "open house" showing; 5) Showing the home several times to prospective purchasers. The actual knowledge and expertice required to perform these "services" are minimal.
If you add up the actual costs of this, including the agents time and gas, you might generously come up with $1,000. With an average selling price of $100,000.00 (yeah, depressed market here), the homeowner is paying $6,000 for these services (many are paying $7,000 at a full 7%). In most cases, higher priced homes require and receive no greater services, so the disparity grows.
This "system" is way out of whack and is in desperate need of an adjustment.
First home I sold I got reamed by the real estate agent. Swore I would never sell another home. But I did, and there were no problems using a broker.