Fort Knox level account protection here

It's clear that their goal isn't to get anything, it's just revenge because they were treated badly. And they're taking it out on everyone.

Then why would they bother to strip accounts and sell everything for mesos in shops rather than npc the stuff? The simply can't target people and are going on accounts at random, but there's so many accounts to go through (and so many are worthless), that it just takes a while.