The reason is: they clearly don't make good business decisions.
I had a problem with my 2007 Malibu that turned out to be the intermediate steering shaft. A part that, per my extended warranty, is covered for "defects"
However, as with any warranty, nothing that's wear and tear is covered.
However, given that the car only has 51000 miles on it, that part shouldn't be worn out already. So I argued the point with the Warranty provider (chrysler addedcare). The repair, through the dealer that the warranty company sent me to, was 440 dollars.
They wouldn't relent. I then asked, "How much will i get refunded to me if I cancel this obviously worthless warranty."
"860 dollars sir."
Me: "Ok... If you guys don't cover this repair, I'm cancelling."
Them: "We're sorry to hear that, sir"
Me: *blinks incredulously* "So... you'd rather send me a fat 860 dollar check than perform a 440 dollar service?"
Them: "Yes, sir."
So I cancelled. They're refunding me my money. I will never buy another car warranty again.