In a Seinfeld episode where Jerry tries to make up a bit for his comic routine, he notes telling Elaine that the makers of antacids have quite a business. They get you take something even before you have any indigestion. It's a market that's interested in buying product to protect itself from a problem that doesn't even exist. Insurance isn't all that different. Most people pay life insurance their whole lives and find to their disappointment that an Acme safe didn't fall on their head while they were waiting for a bus, after all. They buy car insurance and never have the satisfaction of having it totaled in a car wreck. The point is, that there really are several types of insurance that aren't worth buying. Let's start with a couple of options for your car -rental car insurance, rental car damage insurance and collision insurance. When you take out insurance for your own car, your insurer will usually offer you rental car insurance. And this is one useless,...