Whether the Shack is able to maintain that kind of slow-growing zen in the face of profit-minded shareholders will be a key tension for its next few years on Wall Street. Shake Shake made $19.5 million in 2012 and quadrupled that revenue in 2013, to $82 million, company filings show, but it is still a little fry compared with the $90 billion empire of Mickey D's. The Shack earned $79 million in revenue in the first nine months of last year, which is what McDonald's earns in about a day.