I was in business for years with a medical doctor, he owned a farm I ran, he was always amazed at how I turned wrenches, his comment was "god if I could only just let them sit there overnight and come back the next day to finish up later I'd died and gone to heaven", another comment he made one time was, "you have no idea how nice it would be to use a hammer that big on some on my patients" and the best one yet was "all doctors should be allowed to have a vice to put patients in and beat them silly until I felt better, let them sit awhile and come back and blow torch the xxxx out of them as many times as I'd like", another one he came up with was, your lucky when you get sick of looking and working on it you can just trade it off and pawn the problem onto someone else, mine always come back and demand better answers or treatment. Another observation he had was the older the machine gets the less its used and the cheaper the parts are to replace, for a doctor the older the patient the higher priced parts are and more they are need to be replaced and the use stays the same every day and it wears out at a faster rate.
The upside to being a mechanic is the patient never speaks, after having kids you really appreciate that one, employees rate about the same as kids in my opinion, only older is all.
The foreign parts don't bother me as much as cobbled parts that don't belong there in the first place kinda thing.
No machine I ever worked on came back to sue me because I never fixed it right the first time either. Also I've put a lot of rebuilt parts in things over the years and most came with a warranty, I can't ever recall getting any kind of warranty from a doctor, I even asked my doctor one time if it was warranted and he told me this, it sure is, you pay the bill and I'm going to go buy a new car and that is under warranty so in a sense someone is getting a warranty for the job I do and the money you pay, I always though that was the way to look at life, someone else pays and you benefit on both ends, just never figured out how to make it work for me though.