I don't find that procedures to save the lives of pets are anything near the costs to save a human life. (which can be 10's or 100's of thousands of dollars.)
It's nice to pool the costs and spread out your own risk a little bit, but don't forget - these companies are in it to make money. If you have 1 dog or 1 cat, it may be worth it, but if you have several, then over the long run, you're probably better off putting the premium into a savings account for your pet. (imho)
With some research, you can also cut a lot of the costs of the care of pets. For example, just to get a rabies shot, it may cost $50 or so at the vet (including the check-up). Or, quite a few communities offer free rabies clinics. A lot of other shots can be administered yourself (even rabies, depending on the state; I know that NY doesn't recognize rabies shots if administered by anyone other than a licensed vet - weird, but I don't know why.) Of course, it takes a lot of research/knowledge ahead of time, so that you know what you're doing.