That's because he stays almost entirely in Vegas doing sold out shows every day. Actually that's 2 a day and 3 on Saturday! He's been at the MGM forever it seems.

David Copperfield | VEGAS.com

I think the right person won AGT. Not sure the comedian deserved 2nd though. He needs a lot more material.

David Copperfield used to do TV Specials, walking through Great Wall, making elephant disappear, those are gone.
I think Taylor on AGT has material, but is limited to the short period allowed. His mannerisms are an act to make one think he does not know much.

exactly - but that doesn't mean he's faded at all. This happens to many performers (i.e. Celine Dion, Sinatra from the old days and even Elvis to a point). They become so big that they can just stay put in one city, VEGAS, and make all the money they ever dreamed of without all the hassle of travel or doing numerous tv shows. A lot easier life for this level of performer.