He's probably right that its fairly expensive. Since SF spends so much money on paying for homeless people to shit on the sidewalk and allowing SFPD to waste their time not arresting criminals that taking the time out to run the drunk brigade probably is a big financial cost. The board of stupidvisors probably thinks the solution is to tax more to pay for more cops to waste more time to write more tickets to tax more to pay for more cops ad infinitum.
If we actually handled the problems of crime properly, we'd all be a lot better off.
Another thing thats just stupid is the complaint about afterhours - keeping people contained NOT drinking means that when they leave they are more sober than they would've been had they been unceremoniously kicked out at 1:59am...