I've seen truckloads of crushed aluminum cans hauled out of a landfill once...and until it's cashed in that's essentially what it is...garbage.  The cans were probably worth about that much.  Ironically it's really difficult to tip using aluminum cans since the person receiving such a tip would need to go to a recycling center to cash it in.  The time that it would take out of their day (or the person giving the tip should they cash in the cans) would be about the equivalent cost of the fees.  So there's your analogy all tied up in a red ribbon.

Wow I'm a creative smartass sometimes....