When I was in, a lot of women wouldn't consider dating a man unless he was serving in some official capacity. On the flip side, having some sort of appointment could give a young man access to women he'd otherwise have no shot with. The incentive was such that a lot of young male JWs would seek the appointment even if they weren't fully invested in JWism.
In my experience the kids usually get married before they're old enough to be serioiusly considered as an MS (unless they're the super-zealous type that makes elder by 22). I suppose, though, that women marrying men that aren't at least an MS may be an issue, since it managed to make it's way into AMIII's zone visit talk. Though, by that logic, men wearing tight pants is also an issue in the org - trying to make sense of that talk is a bit of a crapshoot.
This was the general rule in my area. If you were a young man who (1) avoided getting into serious trouble with the elders (2) was regular at all meetings and (3) put in at least 10 hours a month in field service, you'd make ministerial servant by 20/21.
If you became a pionner straight out of high school, you'd make ministerial servant by 19. Even super dubs would not make elder until 25 (although I heard rumors of a few men here and there who were appointed at 24, but I never personally knew of any). But by that point, most JWs were either married or engaged. The crucial timeframe was 18-23. That's when the action happened.
I saw a fair amount of hypocrisy from my peers, guys who chased after "privileges" to get an in with certain girls, and almost as importantly, the girls families. If you weren't a pioneer, an MS, or at least on track for an appointment, you were at a serious disadvantage. I know because I lived through this.
I became a regular pionner at the age of 17. I graduated one year early from high school in order to focus on JW stuff with the ultimate goal of going to Bethel. Believe it or not, I was motivated by a sincere belief in the religion. Elders and elders' wives would go out of their way to introduce me to their daughters at assemblies. It was a feeling like none other. I felt like I was king of the world. A few years later my zeal had waned and I found it harder and harder to recapture that joy I once had for the religion.
I was publically reproved for drinking when I was 20 or 21. I can't remember the exact year anymore. In any event, I went from feeling like some giant stud to feeling like an outcast. My reputation had been destroyed. I began dating a girl a few years after my reproval and it was going great until her family found out I'd been reproved. You'd have thought her dauther was dating a drug-dealing, gang-banger with a felony conviction. It was awful.