Ofcourse it is profitable but in my opinion it is not much easy to get success at very starting .
Earlier it was much easy to make earning from newly build faucet site but in the current time it is much hard to get visitors , so you need to give more reward and more refer commission  In this way you can make a big earning if your site visitors are in millions .
If you have unlimited visitors then surely you will get sponsor to view add for particular site .