As an animal biologist, I know that it's really hard to diagnose a problem when the patient can't talk to you! It's harder than human medicine, OP, and words that might lead a doctor to the right diagnosis have to be replaced by whole body scans or invasive exams, plus general anesthesia because the patient doesn't understand what people are doing to him and won't like it. It gets expensive FAST. It's as if you were dealing with a fractious human with limited reasoning who couldn't communicate and had to be anesthetized for the smallest procedures - imagine the costs!
Maybe I'm lucky, but I've only ever had to deal with vets that cared both for my pets (parrot, dogs, rabbits, gerbils) AND my wallet.