By most Wall Street measures, Comcast is overpaying for its acquisition of Sky, the British satellite TV, broadband and mobile services provider. When the U.S. cable giant announced last month that it had won the auction for a controlling stake in Sky by bidding billion, shares of Comcast fell by as much as 8% intraday amid a slew of analyst downgrades. It now might have to pony up more money to buy Fox’s stake in Sky to get full ownership. “ It’s an extraordinary price ,” noted Mike Fries, CEO of rival telecom and satellite TV services provider Liberty Global, on Bloomberg TV. “If you look at any kind of metric that people are taught in business school, yes, they overpaid,” said Erik Gordon, a professor specializing in mergers and acquisitions at the University of Michigan’s Ross School of Business, on the Knowledge at Wharton radio show on SiriusXM . But if transformation is the goal, then the price paid for Sky could very well be justified.…