Same sort of user that uses root for every damn thing. I think Ubuntu's 'how to' culture is partially to blame here, as it inculcates this practice of casually sudo'ing all over the place, like a dog pissing on every lamp post.
@sullybiker One of the distros I use does not permit sudo for that explicit reason as such behaviour opens the door to rampant abuse. If the user needs root privileges, they're going to have to enter their password every single time.