“We don’t measure the demand here in terms of Vegas,” says Dennis Smith, president of Home Builders Research, a firm that tracks the local housing market. “We measure it in terms of the world.” For now, that demand’s adding up to triple cherries for sellers. One has to wonder how Sin City, a place not known for its irony, will cope with a new skyline that, for the first time in its 100-year history, will be funded by winners, not losers.