Getting out is really hard and once you are out there is no guarantee of success. I suspect that there are many "walking dead" within the congregations. These are the ones who no longer believe but don't have the will to leave. I am not saying this as a criticism of these ones - only an observation.
This is a real problem for the organization. A member does not mean this is a believer. Thus, declining donations, and correspond zeal will drive the organization even further into using desperate measures. Which will drive even more to a state of dis-belief.