In a competitive market, you would expect real estate commissions to get competed down between brokers.   For reasons I don't understand, commissions stay high across all brokers at around 5% to 6% per deal.   Can someone help me understand why that happens?

Looking at a comparable process, consider selling a $3M business.   In this kind of deal, lawyers on both sides end up getting something like $30K to $50K.   So your closing costs are something between 2% ($60K) and 3.3% ($100K), but split between buyer and seller (each side pays their own lawyer costs).    What do you get for that $50K of legal services? Assuming lawyers are $300/hour, you are getting about 166 hours of service, which is enough to review the three inch thick document that a large buyer might create for such a deal.   

Looking at selling a $3M home, the seller is losing 5% to 6%, which $150K to $180K.   What is the seller getting for that fee?   Are the agents involved spending even 40 hours on the deal?   And does that 40 hours involve even a fraction of the skill and training required to negotiate and wordsmith a legal contract?    At the $150K commission level, assuming buyer and seller agents together spent 80 hours of time, the rate per hour is $1,875.   That might get split between the broker and the firm that hires him, but it is still many multiples of the closing cost when selling a business.

How did such a high fee system develop, and really the bigger question is why don't brokers compete amongst each other to bring these fees down.   There must be some sort of structural impediment within the system that prevents competition and maintains these high fee structures?