There are good realtors and bad ones. Their are realtors precisely because they provide a service and save people money in the long haul. (If they didnt, everyone would sell on their own, and save the commission)
This is how they help you:
1. They bring a network of buyers to the table with MLS. You cant get your house listed in MLS, therefore the thousands of buyers working in Minneapolis with realtors, will never know your house id for sale.
2. They know the market, and know how to price your home. You may underprice your house.
3. They save you time, by prequalifying people that want to see your house. No walkins that have no money, or waorse, have criminal intents.
4. The buyer of a FSBO knows you are not paying a commission, and often feels half that money belongs to him. Your savings just got cut in half.
5. The realtor pays for all the advertising and open houses.