Is that caused by the Ethanol in the gas, or is there another reason?Not that I disagree with your point sometimes, but I want to point out another side. I don't think it is fair to categorically say it never makes sense to get an extended warranty.
I had my previous truck for 10 years and I never had an extended warranty. With that one, the biggest concern was coolant/tranny fluid cross contamination. That was "easily" fixable with a new $100 radiator and a few hours. So it never made sense to get an extended warranty.
Now, onto my RL. We know there is a TSB on the fuel injectors. It has yet to be seen how widespread that problem really is, but there are numerous cases here and the fact there is a TSB says it is a real problem. Real world costs from what I have seen on here range from $1300-2200. Right now, this is my biggest concern with the longevity of my truck. So I will wait until close to when the warranty is up and determine at that point if it makes sense to get an extended warranty. At that point, there will be more empirical data to work from. Who knows, Honda may warranty the injectors longer, which would make the decision for me. Let's assume they don't and we see A LOT of people have the injector issue (and maybe another TSB or two come out that are widespread). Then my choice is spend $800-1000 on an extended warranty that will probably cover at least $1300. If we saw 65% of RL's to experience this issue, then the gamble would be not buying the warranty because you would need more money to cover that cost out of pocket.
As with anything in life, there are multiple factors that play into making it a good decision. If all of the folks in that study had competitively shopped those warranties and gotten them for 50% of what they paid, would the majority then be happy and say it was worth it?