It is a good idea and being done all over. That idea is called "discount" brokerage in the business. There are whole companies set up to do this. Google "discount broker real estate" and see what you get (8,950,000). This concept is based on two ideas: 1) that it is easy to sell real estate, and 2) that the commission is the barrier for most people.
Discounters don't survive long, in my market area anyway. They don't make enough income.
Many agents' average income is about $16/day with a normal commission. (see
http://www.real-estate-credit-loans.com/howrealestateagentsgetpaid.html )
Discounters start further in the hole.
You have to understand more than commissions to design a good website for selling real estate.