Cashing in on the tourists and recreational bettors who flock to the gambling enclave of Macau had long been Sands China Ltd.’s recipe for success, but it’s hit a snag. The so-called mass market — casual gamblers who visit Macau’s casinos as much for the replicas of European landmarks as the baccarat tables — has been overshadowed the past three months by a revival in VIP custom, data compiled by Bloomberg Intelligence show.