"At a casino, the odds are always with the house. When it comes to extended service contracts and extended warranties, the same rule applies, but the sellers win with different bets -- that you'll never use them, overpay for them, or fail to understand what's covered.
Warranties can cost you plenty, and extended warranties have plenty of fine print. You need to read them before you sign, and do the math to determine what the chances are that one will pay off for you. The odds are already stacked further against you if you don't.
And you may have more rights than you realize to make a manufacturer or retailer address an issue. The Federal Trade Commission offers guidelines on extended service contracts."
To learn more: Are Extended Warranties Worth It?