I always like to imagine the day when we look at 1000 Satoshi in the same way we now look at this 1.00000000 in BTC value. If/when BTC does get mass adoption, then small faucet money now may be worth a fair bit more.
Faucets are a safe way to begin using BTC without any potential loss.
Well, there is the aspect of building up a lot of dust transactions in your wallet, then the next transactions to include all those inputs are going to take forever to confirm or cost a lot of money in transaction fees.