There's also an acceptance in the veterinary profession, partly because of the economics that you describe, that 75% effectiveness at 25% of the cost is a good deal.

Yet for people medicine that's anathema.

Instead, we hide the cruel economic reality behind intermediaries (insurance companies, public hospitals, etc.) and then are shocked when it still leaks out.

No country without infinite money can afford to spend whatever it takes, on everyone, forever.