This is just over generalization of your experience.
A primary care doctor should ask questions like if you are stressed out as it affects your life but they are not going to have a long non-medical related conversation because you are no longer a kid and also they won’t remember you until you go back the next time so why waste time when they can see other patients, unless it’s a psychiatrist. The questionnaire they have has all the required medical questions.
Doctors aren’t out to get your money. You don’t even pay them directly. Blame the health insurance companies for that. If they did want to take your money wouldn’t they make you do more tests and take more of your money? There are a lot of ways to get your money apart from anesthesia.
Maybe there is a different medical reason but it is certainly not to just to make your pay for anesthesia. I’m not in a medical field so I can’t into those details. However, I had some oral surgery and I refused anesthesia as I could handle the pain and didn’t want to pay more money. The surgeon didn’t force it on me. I’m not sure where you live but I hadn’t heard that we are forced to take anesthesia when it might not be required as it is has its own risk. Why would the hospital risk that? Just to make more money when they can just order other non-risky expensive tests?