In my opinion, you should not be feeling guilty for this. As what's been mentioned before that, there's material handling and transportation fees. There's the risk associated with it. There's the professional knowledge that and all the training that you have gone through in order to come app with a diagnosis of the correct part that needs replacing in order to fix the unit. All those costs add up to the total cost of a repair bill. Not only that, you have the overhead costs of the office office staff office equipment, the hourly wage taxes that you have to pay as a business owner. All those go into factor in the total cost of the bill. Unless you are paying this person to do the job for them. They really should not be any guilt associated with the markup cost. And to see something that's $15 being marked up to $17. To be honest, I've seen it much worse where something that cost $15 was marked up to $200. And the customer willingly paid it.
