Because you like penis, maybe?
No, I understand why alot of people can't get into King Diamond. I personally love the falsetto, and the music is just orgasmic and cumtastic.
I actually like King Diamond's vocals. Abigial and Conspiracy are so musically good that someone should be able to get use to the vocals. King Diamond's best vocals are probably on Mercyful Fate-in the shadows. And it rules musically, these albums are musically ridiculous.