Most of the times that I see impersonators I have the feeling that they are mocking The King. Also that they are no Elvisfan, but just do this to make a buck.
I prefer the term 'tribute artist' for people who really are Elvisfan, and perform (mostly as themselves) doing Elvissongs. Of course, some of the weirdos may very well be the biggest fans in the world, but they obvious don't understand that they make a fool out of Elvis (also because they stereotype Elvis so much).
And why are those impersonators always wear jumpsuits, are fat, have a wig, keep on saying "Thank You very much" and do karatemoves that I've never seen Elvis doing? Those people should be protected against themselves (and against the Elviscommunity ).