Yes it's true that the real motivation for being a JW is saving your neck at the mythical Big A. And indeed even the GB are also victims of human frailties but being rewarded for their ignorant rule over the peasants makes them responsible for their actions because they know what they are doing.
Ever the rebel as a beard wearing corduroy suited JW, I always tended towards scepticism and never believed in the devil nor in 1914. So surely most JWs have reservations about the truthfulness of some of the doctrines? Funny but I often mentioned my sincerely held belief that I thought that the devil was not literal and no one ever complained, perhaps they would today?
At its heart this cult is fascist by nature and only rewards JWs who totally conform because it sends a message to the world that they are unified, which they want others to read as "divinely inspired".
But heck, half of the JWs these days don't believe all the doctrines, it's not important; it's just the family religion.