It's not fair to suggest that it's all about wanting to climb the ladder. It's funny how many of you were MSes or elders and now you can only assign bad motives to the ones who are still in. There's still sincere brothers in there who feel that they're just doing what's expected of them: they fulfill their assignments and go out in service, then one day they're asked to be an MS, and they don't feel they can say "no"... years pass, and the same thing happens again, and now they're an elder. And they feel like they're pleasing Jehovah by helping the congregation. They're working hard for little reward, and they don't wear their title like a badge.
Personally, it seemed like a world of pain, and I saw no reason to work hard enough to meet the field service requirement just so that I could be made an MS. But I was rather self-centered. I can't claim credit for having known TTATT at the time, I just didn't want all the work and the interpersonal obligations.