Try to do a home-brewen hardening process on a new set and see how they last?
Afaik, the outdrives of the AE B4 are not hardened and I can imagine some other brands (like Durango) would prefer to prevent such processes (if possible) to save on costs. Not everyone seems to have these problem, right?
So that would suggest that in certain circumstances it does wear much quicker (lubrication without boots on, the fact that the driveshaft doesn't 'slide' much in and out of the outdrive, extreme suspension angles, tracks with a lot of corners to one side, powerful motors, high punch settings, high grip, etc).
And despite of the potential for circumstances that increases wear, it's pityful and unusual to hear it's this bad
That outdrive looks pretty awful brooksy!