They're kinda fun to listen/read about. I don't treat them seriously, I just think of it like it's fiction.
Actually, I'm not really interested in theories that are involved in history but rather in TV shows/cartoons. I remember reading about how the gang in Ed, Edd n Eddy were dead and actually living in a purgatory. Or how the Winnie the Pooh characters represent disorders.
Verrrry interesting theories to me.