Pretty much this.

I was asked to help mod a new community, and things were going pretty well for a year or so, but then the sub owner and the other mods gradually disappeared until it was just me and another guy left.

Well, turns out they were moderating/owning 30+ subs on average. We both quit that day.

I just can't understand what kind of ego boost they get out of being useless cunts in 30 places. How can such little power be so tantalizing to some people?