Bounty campaigns or airdrops are not trash.  They're designed to spread the words around, like advertising for products and offering free samples.  10-15 years Bitcoin didn't really have any values either but people were still mining, buying and owning them.  Look at Bitcoin's price today.  The point is, those coins with no value in your wallet could some day make you money.  Let say you have 20 of them, all it takes is just one to go up and you should be all set.