As long as we're stating opinions on extended warranties I'd like to toss mine into the mix.
Companies that offer extended warranties price them so they will make money. Being in business, they must (overall) make a profit to warrant offering the service. This means that, on the average, they pay enough less out in repairs than they collect to pay their overhead and make a profit. Thus *statistically*, if you were the "average" person and bought extended warranties for everything you buy, you'll come out "behind" in the deal.
That is not to say that I'm against buying them; I sometimes do. In some ways like the gambler in Las Vegas, I try only to gamble on warranties where I think I'll break even or come out ahead. For example... I live in Alaska where there's lots of snow. I lived for years on a gravel road with parking for 8 cars in the duplex I owned. Even though I'd go out and try to get all of the rocks out of my driveway in the fall, I knew the road grader would deposit some in there over the winter. Therefore I purchased one on my show blower when I bought it from Sears. I knew I would put much more and harder use on mine than the "average" person nationwide.
When I bought a dual-base router from Sears last November for $79, I did not but the $15 extended warranty on it. First, I knew that with a tool like that, if you use it when you get it, if it doesn't die right away it's likely to last a while. Additional considerations are that if it were to die my life wouldn't be significantly disrupted (I have others) and that if I really wanted to buy it before it went on sale again, the $120 wouldn't break the bank. If this were a warranty on a $5,000 furnace for my house for which, if it died in the winter I'd be forced to replace it then to avoid freezing pipes, I might buy the warranty.
As far as paying $10 for a 2-year extended warranty on a $50 wireless internet router? Not a chance.
Just one man's opinion!