I have 3 cats and as yet have just accepted the fact that one of them has a medical condition which seems to cost me a fortune. Its a urinary tract problem and means that she needs a medicated diet and more trips to the vet than the others. I don't currently have an insurance policy but do have a policy with the vet that I pay £20 a month per cat for and that covers all visits for all 3 cats, flea and worm stuff as well as X amount off of any work that they need doing and X amount off of any drugs that they need. I keep thinking I will take out insurance as well but as of yet haven't even though I have had several visits over the last few years that have cost sometimes way in excess of £100.
To me they are part of the family and even though at times I have been tempted to refuse the sky high prices on stuff, for example 1.5kg of prescription food at £20 each every couple of weeks, I will never refuse to pay for them to be treated, even if I cannot afford it I will go without elsewhere. I guess it is like having kids in a way, if you sign up to it you better be ready to accept everything that goes with it and sometimes that means pricey visits to the vets.