This paper describes a psychological factor which may make it more likely that people voluntarily enter cults. The same factor may be used by cult solicitors and gate keepers to create "voluntary entry."
"Entering the Cult: The Role of Personality and Self-Peer Agreement,"
International Bulletin of Political Psychology: Vol. 2
, Article 2.
Available at: http://commons.erau.edu/ibpp/vol2/iss2/2