the need(?) for a real estate agent?

An example of how the seller pays the commision.

In new construction often a builder will contract with an agent(Listing Agent) to handle the actual sale of the properties. The listing agent contracts for a certain percentage we’ll say 3% for the sake of the example. Now if a buyer is unrepresented( no agent) purchases a house the listing agent is still paid the 3%. If a buyer is represented( has an agent) the purchase price is still the same and both the buyers rep. and the builders rep recieve the 3% commission. The purchase price did not change and yet both agents were paid a commission. Where did the extra 3% buyers commission come from. Did the buyer pay for it? The commission is paid for by the seller. This concept is not hard to grasp. It is people that want to over analyse something that is simple.
I have never heard of any agent inflating the purchase price to cover the 6% commission, or any seller for that matter. If you know of any agent doing that I would seriously question their ethics. In fact in my company we encourage our sellers to price on the low to mid range of their market, very seldom at the high end.