As part of a marketing stunt for Mafia Wars, dozens of fake $25,000 bills were glued to the sidewalks around San Francisco. It was probably a hoot watching people bend down and try to pick them up but the Department of Public Works isn’t laughing. They say they had to steam clean the sidewalks costing them time and money. . . really money, not that phony stuff. The total cost is still being figured, said a spokesperson to SFGate, but you can bet it’s going to be high enough to prove that crime don’t pay.