Using the faucet earnings that were given for free, you could feel safe when gambling since you will not lose any money. Besides, you could resist free money? Maybe by gambling with faucet earnings, you will get lucky and win even more free money.
If your gambling for fun than these free money should be good enough to enjoy the game but you mentioned that one can make good money if they are lucky may be not correct because these faucet money are very less and very difficult to win big money out of it. And it also depends on what is big for you but for me those are very less.