Where are the street vendors of São Paulo?

 (source)

During this last June when I spent a month in the capital of São Paulo, I noticed something was missing. Back in 2007, I also had spent a month there and anywhere I walked downtown I found street vendors (aka camelôs) selling their stuff. This past June, nada. They had all but vanished, though I did spot one loner among the sea of people that walk along the streets near the Sé neighborhood.