Navy Pier, “the People’s Pier,” has a new attraction — but strictly off limits to the grubby-fingered masses. For the last few days, a 207-foot-long superyacht has been moored at the west end of the pier, one of the largest private boats docked in the city in recent memory. Jay Alix, a Michigan corporate turn-around specialist and philanthropist, is the boat’s owner, a source told the Chicago Sun-Times. Alix could not be reached for comment. “This is crazy. I’m shocked.