I submit that most alternators dont die naturally, they are murdered by overtightened belts, old batteries that are near the end of their own natural lifespan, very frequent short trips that never fully recharge otherwise good batteries, and corroded or loose cable connections.
Went through this argument with my brother. He went through multiple parts store reman alternators on his older Honda over the course of a couple months, loudly claiming they were all junk anymore. Meanwhile the four year old battery sitting there untouched since the day it was installed had enough corrosion inside the crimps and on the rusty cable connections that you could barely even see the clamp bolts. Told him to replace the battery because its near death itself, and replace those horrible cables and clean up the various ground connections and his problems with replacing cheap alternators would disappear. Argue argue argue, round and round. Finally got him to shuddup already and just spend the $120 to replace the cables and old battery and whoa suddenly he stopped having problems with junk reman'd alternators.....
The last reman I bought a couple years ago at Autozone, for my dads Toyota, when they guy handed it to me he said "If you need a warranty replacement for this, you'll need to show a reciept for a new battery as well unless the one in there now is less than two years old." The paperwork inside the alternator box said the same thing. I had already just bought the new battery, and I spent some time cleaning up the cable terminals and checking the crimps and whatever grounds I could find. Its been in there a couple years now, still being driven frequently, no problems...