I can only surmise that some big spending mainlanders complained to the hotel staff about all these dirty hk/foreign guys ogling or propositioning their gfs in the hotel. But then again these big spending mainland guys should not be complaining as they probably got their gfs via the ktvs, saunas, modeling agencies in China.
There are similar cases with regards to 141 walkups, some would get raided if the regular residents of same buildings complain to police enough about punters harassing them or their daughters in the building premises, thinking they were wgs.