I see your point from the other side of the fence.The two things I struggle with:
1. Finding a good mechanic to do the work.
2. Accepting the cost for that good mechanic.
Excepting new customers who will listen to reason and proper procedures.
Find the ones who can pay and don't question every single thing you need do.
YouTube mechanics are everywhere now yet they understand nothing about diagnostics. Three videos can't be wrong, right?