You also have to remember that part of what you're paying for is piece of mind. Any type of insurance "could" be considered a waste of money. Is earthquake insurance worth it? How about term life insurance? Or maybe the biggest statistical waste of money, a home security system. 98% of Americans will never have their homes broken into, and the figure increases for those of us who live in suburban dwellings and lock our doors at night. Still, people feel better about a monthly fee to have their homes protected. Is that a waste of money? Depends on how you look at it.
I'm 38 years old and have been in business since I graduated from college. I'm also frugal with my financial decisions. Extended warranty's are an area where I don't think you can apply conventional busiess logic. Ford's have a mediocre at best reliability history. Call up 10 independant mechanics in your yellow pages and ask them to rate the reliability of Ford Explorers. I'm not bashing Ford, as I think they're a good value overall, but facts are facts. If an extended warranty makes you sleep better at night, go for it.