Gotta hand it to Watchtower. The "Spiritual food" they serve to the flock contains the perfect combination of EXCITEMENT (peace and security announcement/s followed by preaching "the message of doom"
FEAR (Gog of Magog turns on JWs attempting to annihilate them. Then Jesus intervenes to save them and destroy the rest of human life. Better not be on the wrong side at that time!
Greed (The reward= the 1,000 reign of Christ. The paradise, Pet lions and pandas, turning young and beautiful, having EVERY desire satisfied FOREVER
It all may be spiritual junk food but it tastes like Coka Cola and for some is addicting.