Battery ....RIP,......... Death By Polar Vortex??

I've been going to the Battery Exchange on 112th and Powell since I can remember. I've always bought well back then a $20 battery and now they work the way up to 40 bucks. Never had one go bad if never brought one back. They always lasted the life of the car or until I sold it. What incredible luck! Or is it??..
Correction I did buy one expensive *** battery for my duster and it's still holding good here five years later.