What’s with the celeb fascination with outre forms of Judaism?

First, Madonna’s little kaballah fashion craze, now Whitney Houston? Do any celebs ever convert to just workaday Judaism or Christianity, or does it always have to be unbelievably esoteric stuff that nobody’s ever heard of? Is there some celeb handbook that advises celebs in choosing a remote and inaccessible religious tradition so as to keep clear of the common herd?