Qualify for "paradise"? This actually leaves anyone that obeys the religion unprepared--and weeds out anyone that is actually suited for paradise.
For instance, what if someone is a master gardener and designer, but a lousy preacher? Does that person need to put in 200 hours a month in field circus and get 500 new disciples? Using that as the gatekeeper would bump off someone that would be able to grow much food and design homes (and clean up the ruins of the earth). Now, the flip side--what if someone is an ace evangelist and a master at using the Washtowel to recruit people, but absolutely useless at anything else? What does this person do when the preaching work ends and the rebuilding work begin? This person would, according to Washtowel doctrine, be prime material for "paradise", having averaged 200+ hours a month and getting thousands of new recruits. But, the same person would be worthless once the focus changes.