I imagine it's his way of making his work accessible to the working class. I Know of someone whose house he erected a piece of work....she had it carefully removed and earned millions from it. Some would say why shouldn't the working class benefit from it? Some would say it's equal distribution...provided they replace the satellite dish, pay for the sign..
Some would say he commits a crime by defacing public property
Some would say they appreciate the art in their area
some would say it's mediocre work.....
Some would say I don't care what it looks like, it could change my life....it's understandably tempting