Not like they will refund a crappy old rebuilt master cylinder after a couple years.
Nobody has said it yet, but some of the many problem with warranties are:
. they very often expire in time
. they often only cover the original vehicle owner
. they sometimes require you to ship the part for inspection
. they often don't cover you if you can't prove periodic maintenance
. they sometimes pro-rate the replacement (which often costs more than new)
. they sometimes require additional labor (or parts) which again makes using the warranty prohibitive
. you're often disillusioned with the brand & yet it requires you to use it again
. and, oh, yeah, you often have to have the receipt
Hence, I never buy anything under warranty unless the warranty just happens to come with the part, which is to say the warranty is never part of my rather rational buying decision unless I know something they don't know.
For example, if I know that my vehicle chews through a certain part, then I might buy by warranty, but I can't think if a situation where I've ever needed to do that.
Likewise, people who don't understand specifications often buy by warranty because they understand numbers only so they fall for the classic marketing tricks which cater to people who can't measure or understand things such as cold cranking amps and amp-hour ratings - hence those people buy by warranty (one year, two year, three year, etc.) as if it had any meaning with respect to performance.