Any good reason at all why you might join a sect?

Hypothetical. Sects don’t have to always cater to religion or spirituality. They can be about a lot of things, and can work in different ways. Take my italicized sentence as the prime example for this hypothetical situation. You would have to submit to the rules and traditions of this sect, and accept to cut yourself off from society, friends and family in order to live with the people in the sect who work to pursue some meaning, belief, goal or idea, and define your life, and who you are, through it.
Would you ever do something like that? Are there any ideas out there that would convince you to join a sect that catered to whatever said idea? It can be anything, from traditional religion based sects to spending your life watching b movies or idolizing a famous person. Would anyone ever be willing and ready to give everything up for a certain cause or belief? And why would anyone even do that, when considering that a lot of sects are just unhealthy for someone’s mind? (or so I imagine) Or don’t people figure that when joining a sect or a cult?

Humor welcome too, of course. :)