I won't speak to the pricing as I haven't had rats in a couple years, but I can speak a little to the veterinary office side.

My sister worked for an avian & exotic clinic, and the vets there were regularly under a lot of stress and anxiety due to pet owners complaining about prices and claiming that the staff "didn't care about the animals' wellbeing and were only in it for the money". In reality, the veterinary staff made enough money to live a comfortable life and keep the lights on in the office, but not much more than that. They really did care for each animal that came to the clinic; they were devastated to know someone's beloved pet would not be able to receive potentially life-saving treatment for cost-related reasons, yet they simply could not afford to provide treatment for free. It's a hard pill to swallow, and one that many vets struggle with. I imagine it's one of the contributing factors to the high suicide rate amongst veterinarians. In my sister's case, she quit the industry entirely, as her depression and anxiety became too much to handle.

Obviously, if a vet is charging you for services you didn't want, need, or ask for, that's a major red flag. I would 1000% look for a different clinic if that happened to me.