Originally posted by @Joe Splitrock:
1. If a home sold itself, the market would move away from agents. There are many examples of industries that have changed and moved towards a different sales model. If agents had no value, their pay would decease or an alternate sales model would replace them.
2. If it is true that an agent just makes tons of money for doing nothing, everyone would move into the profession. As Sarah pointed out, a large percentage of people who become agents fail. That supports the fact that it is not as easy as it looks.
In the posters original example, the first deal he did the agent probably did more work than he got paid for. The second deal, maybe they got more paid more then the work they did. They are not paid for the difficulty of each deal, so it has to average out.
In the for seeable future, the traditional real estate sales model with 5%-6% commission on the final sale price - at least for single family homes - will slowly fade away. Home-buyers and seller's will benefit from the advancement of technology and software, relieving the consumer's need for a real estate agent.
How much more work did a real estate agent do 20 years ago? 10 years ago? 5 years? The average home-buyer today has a vast amount of resources to access an data that was once unavailable to the open market.
Justifying commissions based on the law of averages is not a very solid sales model. The agent has to take ownership for a client they decided to take on, but in the end turned out to be a complete nightmare.
Commissions on sales are just one of the many grossly inflated costs that are involved in the home buying and selling process. I really think that further advancements in technology will slowly eliminate this gap and will lower the final price of home buying.