It's very hard for potential buyers to become aware of the house you have for sale without it being in the MLS system
Realtors control access to the MLS system.
See where I'm going with this?
https://www.nar.realtor/nar-doj-settlement/multiple-listing-...
If you don’t want to pay the real estate agent organizations, you can put your real estate listing on Craigslist, buy online ads, stick a sign on your yard, go door to door to various real estate agent offices, etc.
Our real estate agent worked pretty hard for us buying and selling and we were glad to have him. When we found our new house, it was on Zillow for only 8 minutes and he got us in first during a peak market. It was his tip that "sellers will often stick with the first buyer who offers selling price instead of waiting for better offers" that allowed us to beat everyone else, even though our sellers had actually gotten a higher offer because it made us give them an offer immediately after our first tour. This was after we had basically lost out on three other sales for houses that we wanted (not his fault - we weren't first or highest on those).
The next two sentences are simply false.