There are many ways to interpret something like the bethel meeting standing room only scenario.
Reason 1:
Overcompensate for doubts, boredom, immorality by pioneering, going to bethel, school for couples, etc. Possibly the same is true here.
Reason 2:
If you are judged by full time service and field service accomplishes absolutely nothing, bethel becomes the only thing you have left to try, unless you can afford to move where there is a "need." Since there are not a lot who can afford.. There us go