I see them as a bad way to earn money from only Advertising
Faucets, it seems that they make more money from you than you from them :-)
In many cases it would be true. Faucets pay very very little. Ones that stick around do make a profit. But they make it from lots and lots of people using it.
I for the life of me cannot explain why someone will sit at a computer for hours on faucets and hope for maybe 5 cents? Its crazy.