It's all well and good to say fix it yourself, and I am pretty handy at fixing stuff on my RV, cars, etc. but one thing that many don't consider - many of us don't have the time nor the inclination to do this. For those of us in that boat, a good extended warranty is well worth the cost.
I bought extended warranties on my truck, my pre-owned Audi, and my present RV. On the Audi I made the cost back in just under 4 visits to the dealer and the process was smooth and hassle free every time. Never had to use it yet for the truck or RV (knock on wood) but for me it is worth the cost. I will most likely be getting another extended warranty on the new RV also.
So there is no one size fits all for this. Likewise with insurance on the RV - mine is fully covered also. When I can't afford these payments I can't afford the lifestyle. Of course when the vehicles get old then that is a different story.