I agree in principle, but, on the subject of insurance, it's not always the saviour.
I've had two experiences where I've been paying a fortune for insurance and then had to pay the bloody vet bill anyway because they've haggled and argued ridiculous and non valid points to avoid paying out. And it's taken me months and a referral to the ombudsman in one case, to get the money back.
They will exempt certain things over a certain age or with the slightest excuse IME too, premiums increase and cover reduces making the insurance redundant.
I think most vets are worth what they charge, to me it's the insurance that needs a kick up the arse tbh.
I do get frustrated when people spend thousands on an animal and then can't afford to treat fleas or injuries/illness, or routine things.
But as pp said, circumstances change and it doesn't cost anything to love your pet and they can mean the world to someone who doesn't have anyone else.
I thought I was doing the right thing by my dog insuring her until they exempt just about every part of her body (for example a leg exempt completely from any claims because she ripped a dew claw and the vet cleaned it and gave antibiotics, I didn't even claim because it was barely above the excess and the vet said once healed it wouldn't cause any problems at all and it didn't, but if she'd broken that leg in a completely unrelated incident then there was no cover, break any of the other 3 and they were covered, it's crazy).