Extended warranties are never of financial benefit unless a covered item breaks. The probability is MUCH higher that your item will not break and your money could have been poured down a hole in the ground for all the good it did you. That is why people sell the extended warranties. Selling extended warranties puts a lot of cash in their pockets and costs them virtually no more than the price of a piece of paper to seal the deal for each warranty they sell.
If you add up the prices of all the extended warranties that people want to sell you (for your new automobile, dishwasher, television, camera, etc.), you would have the price of replacing most of those items (except for the automobile, of course). If you took the money that you might have spent on those extended warranties and tuck it away in a savings account, then you would be covered to repair (or in many cases totally replace) an item that breaks. The probability is that the money would never be needed, though, and you would benefit by having it in savings.