What I did was look at what local sharpeners are charging and price my service competitively. I do charge a little higher as I sell my service as sharpening on natural stones.Yea. Tbh, I'm not so worried about people complaining about wedging on their Wusthofs and Vics. They're usually as thin or thinner behind the edge as when I got them, and I think my main local competition is like the local kitchen store or Ace hardware, and I'm pretty sure they don't do as good a job. Maybe I'm being naive tho.
And don’t be afraid to reject crap knives or knives that do not give you a good ROI. Be honest with the customer because you cannot be doing a losing business unless you’re in it for the hobby like me.