There’s no way it costs more than your doctor. You are either glossing over what your insurance is paying for you, or your doctor is seeing you in a back alley somewhere.
Also, you’re not paying for the vet’s time spent looking at bloodwork, which I actually do believe is 5 minutes. You’re paying for the 4 years of undergrad, 4 years of medical school, (and if they’re truly a specialist) several years of residency and being boarded, plus many hours of specialized continuing education per year.