Most of the faucets are having an upper limit for payments. Users must accumulate that many Bitcoins (say BTC0.0005 or BTC0.001), to qualify for the withdrawal. Still... the transaction fee can be heavy.
Weekly batch payments can help to solve the problem. User must accumlate 0.001 and cashout will only be done once per week. This way, the operator can pay 0.1 for 100 people and only use a transaction fee of 0.0001