Bus Change Business for Homeless People

In places where exact change is needed for bus fare (if such places exist anymore...I drive a car in a small town), a homeless person could sit at a bus stop with a bowl of change. Bus riders lacking the proper coinage could exchange their paper money for the proper fare, with the understanding that the addressless entrepreneur would keep a small cut for himself. You could even tip him, if he provides good service by being courteous, not giving you dirty/sticky coins of dubious provenance, and exhibiting rudimentary grooming skills.

People might be more inclined to give him money, as they perceive he is providing a service, and he might find a slightly increased sense of dignity for doing so.