Faucets are usually so small amounts that their only purpose is to get familiar with the coin and the way how things work. No way you can actually earn something clicking on faucets. Sometimes you might need to make a minimal transaction for some reason, that's when you could use a faucet if you don't have the coin yet. It's usually a few clicks process, so much easier than to go to the (new) exchange, send bitcoin/ethereum/buy/convert/send back...