OE CV boots are made from thermoplastic and don't need any maintenance other than an occasional rinse. They should be pretty sturdy over the life of the vehicle. When they do fail, it's usually from physical damage, or improper suspension geometry such as lifting or lowering. Usually it's only the boot that goes wrong, the axle itself only fails when enough grit has gotten inside to deteriorate things mechanically.
The problem is, it's usually cheaper to slide in a replacement aftermarket axle then it is to properly do a re-boot due to the labor. Not to mention that OE boots are hard to find and could cost as much as an entire aftermarket axle. Almost all aftermarket axles use neoprene boots instead of thermoplastic, which is vastly inferior and might only last a few extra years. Neoprene quite literally degrades in ozone.
