I suspect that Scientology interests JtS for the same kinds of reasons as it interests me. An enquiring mind, the fact that it has recently been in the news, the way in which what to some people seems ludicrous is so important to others and whether it poses any kind of threat to individuals or groups.
I could of course be wrong in that supposition. The idea that you have to believe in something to be interested in it seems odd to me. I find Hinduism, Islam and Sihkism interesting, I would have trouble believing all of them at the same time.