Just browse around, you will see the option, where you reward "active" referrals. They will soon see some extra Satoshi coming their way, if they are active.
That also gives you the edge on other people, when you build the referral network. {State publically on forums or Blogs, that you are giving bonusses for active referrals and keep to your word, by automating this option..... yes you lose a couple of Satoshi's... but you gain active referrals.
People sometimes move onto other faucets, when they feel the payouts are too low... So giving away a small amount in rewards, will keep them from going "in-active"
But sure... it is a problem.. but NEW blood feed the old referrals leaving.
Nice to hear that people are still using freebitco.in and its referral reward system (it was my idea to share some profits with your referrals). I've long ceased playing there (almost for a year by now) but still have 4-5 active referrals at the faucet (giving back 50% of the commissions I'm getting from them at the end of each week)...
So it seems that the faucet is still worth it for at least some people