This is one of the biggest motives that makes faucets die. If users have consideration by faucet owner everybody can makes profit in virtuous cycle. But there is always someone trying to cheat stealing all faucet balance. So the faucet die very fast and everybody loses. We need better protection for faucets and i think faucets that pay manually can prevent themselves better against hackers and bots.
Well humans will always be able to program a new bot just to clean faucets balance,and they sell the bot,and guess what if they collect from all faucets on a 24hours a day i believe they are able to make atleast 0,02btc daily,as i dont know how many faucets around still paying and using faucetbox and others processors.