Look at my comment about fake teeth, you would be surprised by how good surgeons and dental techs could do, but a bunch of patients waltz in and tell you how you should do your job. They literally demand things that look horrifying to be "extra". They treat medical procedures like it's shopping, where the customer is always right.
Now of course doctors with some spine and integrity will try to explain to them it's not the right way, but many just refuse to listen and doctor shop until they find one that does it.