If your repair person has gotten burned in the past it's not unheard of.- they may have had no shows, very overdue pick ups or people who wiggle out of payment by canceling a check or card payment. We have shops near us honest and not. Those who are honest have a sign posted of a minimum bench fee for looking at a machine if they choose to enforce it.That said they also have made it clear if they can't fix it they don't charge. One of our local shops has done this for 2 generations and have on many occations told a customer who isn't paying cash to just stop back in when they have it so the charges for running the card isn't more then the cost of the work. We restore machines and refer people to businesses like that instead of taking their work.