Medicine has progressed so much since the early 60's. Back then small animals were still a sideline for most vets, & nearly all practices were mixed.Treatment options were far fewer.Most didn't even have an Xray machine.
My vets are brilliant about charging, they are known as an expensive practice (they have a lot more diagnostic tech than the alternative one), but they are very pragmatic about keeping costs affordable. My dog's a model patient so they'll do things like a needle biopsy in a routine consultation with me holding him.Happy to write me £20 prescription for expensive drugs.
By the way, frontline is really not reliable, it kills fleas if they're not resistant, but round here it doesn't work at all. That's why they have to keep coming up with new generation flea treatments, although each is more expensive than the last of course!
Some of the prices quoted on here are hair-raising, an op on a child for a broken bone NHS is re-imbursed 2-4.5k for common ones, so why 15k for a cat?