What do they do with the pennies?

On my second time through the Detroit airport a couple weeks ago I saw that they had drained one of the beautiful fountains in the middle of the airport. The fountain was covered in spare change that people had thrown in there for good luck. I mean every square inch was hidden by an overlapping pile of coins. One of the unlucky janitors was busy shopvacc'ing all of the change inch by inch. There must have been a couple hundred dollars worth of change all told and I wondered three things. First, how many shop vac containers worth of change was there. And second who gets to keep the money? Third, how often do they have to clean out that fountain for money?

Ideally it would go one of two places. Either to the janitorial staff, as kind of an unannounced bonus, or to some kind of charity. I would be very very upset if that money somehow got eaten up by the corporat emachine to pay executive salaries. I'm almost sure there's some plan for the coins, I just hope it's a good one because the karma behind taking what people used to wish for luck, and spending it in a terrible way is pretty darn reprehensible. It's like stealing money from the church collection funds, or selling flowers outside of SPAWAR under the pretense of raising money for leukemia research and pocketing it. And then having Marty take those flowers he bought and giving them to the girls at the front desk of the gym because he had nothing else to do with them....