And what are they going to do when they find out that the New Dark Ages is a scam? Trouble with religion, you need to die in order to find out that you are not getting anything special because you were obedient. By then, it is too late.
Also, what is the extra reward for doing more? This is as true with any religion. Going to a few boasting sessions and one hour of field circus per month should get you just as in as wasting your life running the show, doing missionary work in every hellhole country in the world, and taking the strictest stand on every issue. Other Christian religions share this problem--if you can go to heaven by reciting the Magic Prayer, why in hell do you need to do anything more? I am NOT going to improve my situation one teensy weensy bit by giving up everything, and then going to a place like Nigeria and wasting my whole life doing missionary work and planting churches. Is there any PROOF that making the extra sacrifice is going to result in better conditions later? If not, then I would rather simply live my life, and not have that Almighty Lowlife Scumbag meddling by closing out my options so I will have less disincentive to not do the Nigeria mission (which seems to be where most of the Christian and Jehovah's Witless missionaries end up getting sent).