As was mentioned before, this requires a few things that are going to be incredibly difficult to get in such a setting.
First, a person that is A) Charming enough to get people to go along with it, B) Completely hateful of the setup around him, and C) Willing to throw away the free food and shelter in exchange for being shot into the unknown reaches of space. I'd be completely willing to buy that an outsider could do this, but it would be hugely dependent on the outsider gaining access and knowing a lot more about the inner workings than could easily be discovered.
Second, it requires that none of the other people in the cult have no friends outside of the cult, because that means that others could see what they see and all that jazz. Loose lips sink ships. With a hugely charismatic figure, one that had time to convince others, this could be done. But such a figure would probably be better served by getting the flow for himself, and just enjoying the benefits of having it all.
Third, presuming that you fulfilled the previous two requirements, there's always the risk that the cult members start hating each other due to overexposure. It'd require a certain measure of self-control that's hard to imagine in a society of this sort. It's hard enough to learn to not loathe roommates for their little idiosyncrasies in this day and age, where having the discipline to just walk away before an argument gets ugly isn't commonplace.
But, given a miracle, it could happen.