Extended warrenties are a huge profit center for the dealers. We have purchased two New Greyhawks, and did not buy the Jayplus Plan either time. So far, so good.
I think a lot depends on an owner's willingness and/or ability to do some of the unforeseen troubleshooting/repairs.
Deane, Carolyn, and Kasey, our three year old yellow lab.
2011 Greyhawk 31DS,:) upgraded from a 2008 Greyhawk 25DB.
2003 Explorer Sport toad.