In Australia at least a lot of these "extended warranties" have so many exclusions and conditions they are not worth the paper they are written on. The conditions also include mandatory servicing at one of their outlets and the prices are exorbitant.
99% of people will have the cost of any repairs they have made under warranty well and truly swamped by inflated servicing costs. My sister made a claim on a replacement "starter motor" only to have it fail again 3 months later out of warranty. Dealer remarked "well, they only last about that time". Was a Lucas but even so ................ Son had a timing chain fail on his Daewoo, shagged the engine completely. Even though it had been routinely serviced as per the book by the people supplying the extended warranty they refused to cover repairs to engine. A plague on all their houses. John