This is faucet site, right? Then what kind of abusers we are talking about?
What I know is they already give one claim per one IP address so if you have many accounts also you can claim once every one hour.
I did miss some old discussion about the abusing this system?
Yeah hidden deep within this thread. People have scripts and bots that get around whatever measures they put in place. I remember one time Wetsuit saying he banned 50,000 accounts all belonging to the same person.