I agree with most of what you say and never said you provide substandard service which I’m confident you don’t. What you provide is limited service. I provide full service. For example, this Winter I had a client who needed to get their home ready for sale. They figured it would take a month. In 5 days, I had a large home painted, re-carpeted, plumbing issues addressed, electrical issues addressed, landscaping improved and had the home staged. My clients saved about $3K to $4K by using my contractors (many at direct wholesale rates). Their house went on the market, priced right and sold quickly, before the market got even worse. I believe it made between $25K and $50K difference getting their house on when they did. This is but one example of how realtors can earn their pay.
BTW, I charge 2.5% for full service on my side and invest heavily in my listings for things I believe will directly lead to the sale of their home. I hate spending money on things that have ZERO ROI and tell my clients so.