Is Street Cleaning A Scam?

"...a doubt began to gnaw at my mind: Is the city actually cleaning its streets with the same ferocity it issues parking tickets for those who obstruct street sweepers?...In Los Angeles, as in most other crowded cities, parking violations have become a reliable stream of municipal revenue...much of the housing in my neighborhood is high density -- buildings...that don't have driveways or garages. So strictly enforcing a street-cleaning zone is easy pickings for the city..."