How did they hire homeless people to buy the new iPhone?

The news reports that someone hired dozens of homeless people to wait in line to buy the new iPhone 5S that came out. I don't think homeless people have the cash to buy the phone, but if the guy gave them money to buy the phone, they would've run away with it so that wouldn't work. So I'm curious as to how this worked.

They could of gave them money and offered an even larger reward if they actually returned the phone. Or they could of pre ordered it and offered a larger reward then the phones worth at a pawnshop for returning it.

They just pay them by the hour so they stand in line, they when the store is ready to open you take their place and pay them.