I think it is more to do with the fact that someone of note from that genre would actually consent to appear on a cheesey reality show like American Idol. I mean it's not as if Idol hasn't had its share of notable guest stars- they still have a huge audience that is worth targeting, no matter how much it might sting the ego of whomever. But metal doesn't usually play that way. I'd be interested to know who made the phone call. It can be perceived as lending an air of legitimacy to James.