McDonald's currently trades at 27x forward earnings; Shake Shack trades at 143x and Chipotle at 69x. As for the restaurant sector's successful year so far, Josh Brown of Ritholtz Wealth Management says there are outside factors at play. He points out Shake Shack, which he consistently champions on the "Halftime Report," is up 100% this year even though its fundamentals haven't improved by that amount. Why? "The reality is Wall Street likes these companies again and a lot of it has to just do with an overall strong environment..