One area that I feel like I can clear up is this...anyone that will stand out in the Las Vegas heat in full costume, ie. Chewbacca, Elvis, Incredible Hulk, etc, freaking DESERVES the best tip that any of us can muster as we make our way past these dedicated souls.
It would be brutal to stand out there all day long getting fried in the heat even if you WEREN'T in costume, let alone in full garb so as to entertain the passersby. I gave Chewy $20 the last time I saw him...and I should have dug deeper. He had to be sweating off 15 pounds a day out there! Just trying to help here.