Most homes for sale are listed on the MLS with a seller’s real estate agent. Most of those are listed under a contract called an “Exculsive Right to Sell,” with the seller’s agent and buyer’s agent commissions already agreed upon. That means that a buyer’s agent is already paid for if you buy the house, whether you have an agent or not. The seller pays for it from his proceeds. Make an agent earn that commission by working for you!
So where does the money go if you don’t have an agent? In that case, the seller’s agent usually is entitled to both sides of the commission.