What I mean is the Mormon's have their own set of wacky beliefs and are a pretty insular group, engage in a form of door to door ministry but don't discourage higher education. In fact, the handful of Mormons I went to school with were pushed to excel academically and go to college. Yeah there are ex Mormons but for a great many, going to University doesn't turn them into atheists. They study biology, philosophy, physics etc. but still manage to keep believing in seer stones and a magical tophat, the planet Kolob and Jesus visiting the native americans. Cognitive dissonance and family ties are pretty powerful.
The main roadblock for the JW's is they'd have to lighten up on the 'end is coming soon' rhetoric. But on the other hand, engineers and doctors and lawyers have alot more money for the contribution box.