I see so many faucets around. Do the operators profit from it?
Not always. For example, FreeDogeco.in owner said here that he has stopped promoting it as he is ultimately losing...
I get many requests to make altcoin faucets but the dogecoin faucet that we have has been operating at a loss for a while. Click through rates for ads on it are half of the bitcoin faucet, people don't gamble much and most withdraw immediately after each free roll. The loss isn't too much though so I plan to keep it running for as long as I can, but I have stopped actively promoting it and it has put me off from making any more altcoin faucets.