For me, being raised a JW, I know I was groomed from the time I was baptized. The pressure to achieve status in the congregation, first a MS, then an elder is very real. Of course, at the time, I was really thinking I was doing Gods will and that I was helping. I never once lobbied anyone to do anything and was frankly shocked when approached to be an elder. I really didn't get much of a chance to say no. They talked to me right before the meeting that it was announced and that was it.
I do know several folks that actually did lobby and I always viewed them as being power hungry. I also know many who won't do anything unless it puts them in front of the congregation (actually these are the same folks that lobbied).
They really don't tell you the amount of work that is expected. You think you know, but the reality is eye opening. I've had several sleepless nights worrying about folks. Been in really bad moods due to something going on at the hall but unable to tell my wife what was wrong. Had months were I had a meeting part every single meeting or meetings after meetings. Then, there is the elder schools where to a person that actually cares just a little, they beat you and tell you how awful you are, how you're letting God down. I was usually depressed right after those schools and we always had at least one person try to step down because they didn't think they could measure up.
I've obeserved and its certainly true in my case, that the only way you can cope with the constant barrage of problems (many caused by the WT approach of grinding folks into the ground) is to not feel. Yet, a successful shepherd has to feel. I really believe that is why many step down because they're forced to emotionally distance themselves from the congregation and the stress of doing so becomes too great.
The ones that are left often are the ones who love the power, the prestige, the attention and in their minds the superiority they have over the other males. It's a sick game and the machine is the only winner.