An extended warranty is an insurance policy and just like every other kind of insurance, the odds are in favor of the insurer - not you.
When electronics fail, they usually do so very early and that phenomenon is affectionately known as 'infant mortality'. If you pay for an extended warranty and never have any problems, which is the normal case, you have wasted your money. If you do have a small issue and the cost of the repair is smaller than the warranty cost, you have again wasted your money. Remember that the odds are in favor of never having a problem, otherwise the insurance company would not offer the insurance.
In general, extended warranties should be avoided. Some people think they are worthwhile for 'peace of mind' but financially it is a poor bet.