At our assemblies they were always having experiences of teenagers who had resisted Satan's temptations to engage in worldly pursuits, etc., and how happy they were to be in Jehovah's service. Clyde and I would often look at each other and ask, "Wonder where they will be in two or three years. Will they still be around?" I bet that 4 out of 5 of them were either disfellowshipped or just disappeared--and often within a year.
Oh - an elder in our congregation a few years ago told about how he worked for this little printing company and often had an opportunity to work overtime on Saturdays but resisted the temptation so he could go in field service. What he didn't tell them was, he was actually VP of a large printing company, made 3 or 4 times as much as the workers, had his home and cars paid for, and was on salary rather than hourly, so it didn't matter if he worked extra hours or not.
Bonnie