alt Hacker NewsSounds a bit like the guys that collect the sludge from the sewers in jewellery and gold smithing districts in cities, then pan it for gold. Its not going to make anyone rich, but theres enough gold dust in there to buy some food and shoes for somebody hungry enough to dive into a sewer and collect sludge!
Supermarkets that make you put in a quarter to take a shopping cart are really just paying the homeless $0.25 each to return them from the parking lot.