If we forget all the bad things cults do for the moment..
Rationally, the MOST SUCCESSFUL cult members are those who don't believe in their doctrine. Thus, they are free to make objective choices in the scope of their surrounding for selfish improvement.
Given that.. It is not Idealist bible bangers who should join churches/cults, rather it's the Heathen NON-believers that potentially have the most to gain.
For example, Many Churches and Cults are wildly successful at cash laundering AND are not Subject to taxation..
Certainly , these actions are not those perpetrated by a person who reads the Bible, rather they are actions by the more intelligent manipulator who exploits this small loophole in our cultural economy, in-god-we-trust.