not sure there is always any rhyme or reason to pad wear.
I am no expert at bike/brake setup neither am i particularly dilligent about bedding pads in properly. Nevertheless:
-i had a set of juicy fives for a year and i never changed the pads they came new with. That includes a couple of wet rides in the quantocks and dozens of filthy ones in the woods.
-Mrs julian is also still hardly into the pads that came new on her juicy 3's after 8 months and rides/races in all weathers. And she has never changed the ads on her bb7's which unlike our other juicy brakes howl like crazy (but stop as well as the other avids)
-my mates who ride far better and brake far less go through juicy pads all the time though.
-I have however demolished stock formula pads in a gritty ride with a sticky piston on the back one whilst the non-stuck-pistoned front one went on for months after the back one was freed up and pads replaced.
I read terrible things in bike press about early shimano resin pads, but always got loads of life out of shimano's own resin ones on my old 525's (which are still doing fine age 6 and bled once, never serviced on a mate's bike)