This. This times 100000000000x's. Many years ago my pet cockatiel became ill and my Mom rushed him to the vet. When we got there all they said that could do was put him on oxygen and hope for the best. What they didn't say was that oxygen was about $2 a minute. On top of that they kept us waiting quite awhile despite us having decided to put him down to end his suffering. When the bill came my Dad happened to be there and his only response was, "With that money, you could have replaced him with two birds". Even if the vet visit did turn out to be a waste that time, it's an example of how some people think when it comes to pets.
(I will add that my Dad does love his dog and would do anything should the dog happen to fall ill if he could afford it, even if it went beyond what a replacement would cost. It depends on the person/animal relation I guess).