Cognitive dissonance

Cognitive dissonance can be seen as an antecedent condition which leads to activity oriented toward dissonance reduction just as hunger leads to activity oriented toward hunger reduction. It is a very different motivation from what psychologists are used to dealing with but, as we shall see, nonetheless powerful.

Source: wiktionary

In the state of ultimate commitment, a true believer feels better for having raised and or given money to the cause. It also aids in overcoming cognitive dissonance (the cause "must be" worthwhile to have attracted these funds). All kinds of rationales are given and accepted for the displayed wealth of the leaders, but it is fascinating to see the blind acceptance being replaced by questioning and scorn as the hypocrisies and double standards begin to make themselves felt.

Source: wiktionary

If a given activity fails and it causes the death of a follower, it is because the rest of the group had insufficient faith or that it was done too late. Should the extraterrestrial beings not descend at the appointed time, then it may also be explained as due to their being frightened by the non-believers. Thus all plots and prophecies become possible — the capacity to reduce cognitive dissonance is the cement of the cult when it confronts reality, and this is why the layman is helpless before the nonsense that is spread by these speeches.

Source: wiktionary

By turning over all their possessions, members were making an irreversible commitment to the cult. Once such a commitment is made, people are unlikely to abandon positive attitudes toward the group (Festinger, Riecken, & Schachter, 1982). After expending so much effort, questioning commitment would create cognitive dissonance (Osherow, 1988). It is inconsistent to prove devotion to a belief by donating all of your possessions and then to abandon those beliefs. In other words, to a large extent, cult members persuade themselves.

Source: wiktionary