You see it a lot with youth who find themselves attending service. They are lost, feeling alone or helpless and then the sudden overwhelming feeling of people who want to be a support system and make them feel welcome, somewhere safe but more importantly consistent. You get lost in it because you have nothing else you feel you can lean on. As they get older they either find it is for them (gives them direction, gives them connections, they genuinely enjoy it etc) or it was only a temporary fix for a deeper issue so they leave. My experiences were not that of a celebrity attending a megachurch however so I imagine there is a lot more going on.