What AMPhunter said, they (MBI, LEO) will bust a place if they get enough flack about it. Be it from other tenants in the building or bluehairs in the area or made wives wondering why their hubby's CC has a $200 charge to XYZ entertainment a couple months in a row.
OR
They (MBI/LEO) are looking for a quick PR boost, nothing like shutting down a 'house of prostitution' were women are exploited and drugs are dealt and used... That is the spin they put on it at least.