For me, the value of the broker was just someone to guide me through the whole process because I'd never done it before. It was good to have someone whose interests were pretty aligned with mine and who answered questions quickly and thoroughly without me having to pay by the hour.
Another big part of the value was finding the buyer, as I probably couldn't do that on my own. I could have thrown a hail mary and listed the business for sale on the TinyPilot website and my blog, but the person who ultimately acquired the business definitely wouldn't have found me that way.
Having gone through it, I would consider foregoing a broker in the future if I had some way of finding my own buyer, but I have no regrets about the broker for this sale.