I confess to buying the song used as the Vanderpump Rules theme. And, if crystals make people feel better (even if it's just by making them think they feel better, if that makes sense), then who is it hurting? No less questionable than religious services and rituals, IMO, and at the very least, you get something cool (if overpriced) to wear. People swear by yoga* and meditation, which not only do nothing for me personally but actually try my patience.
*Yoga without the hippie aspects (especially flutesy sounds, ugh!) is fine; I do love a good stretch!