I worked with Redfin years ago to sell my house. The agent came in, shared his analysis and wrote down on a piece of paper what the house would sell for and how much I would make at closing. We officially listed the house on Friday at the previous suggested number, had 3 offers by the end of the weekend and accepted the only realistic offer a few days later for almost exactly the price he stated. Mind you this was back in 2014 so the market wasn't white hot and our house was just another house on a street where most looked the same. I can't recall why we did not qualify for the 1% rebate back then but I believe he deserved every penny of his commission.
However I have been on the mortgage side of the business as a loan processor and it seemed to me that for the most part realtors were lazy. It seemed crazy to me no matter the work involved they expect that 3% commission. In the end you are having to pay to access MLS, and that access costs 3%, even if the house could sale itself due to the area or market. I have seen realtors advertise that if they don't sell your house in 30 days, then they reduced the commission, which I think is probably the best way to go about it. I would rather get the sale done quickly than what usually happens where the realtor lists the house for what the sellers want and then they have to keep dropping the price because its too expensive.