playing with profit of course is a good strategy and safe. I always do this to keep my bankroll. so that I don't lose it all in an instant.
yes no doubt about this i am also in favour of playing gambling with profit, because through this way you are saving your own money, and if you are loosing after investing your profit then its mean that still your profit is safe.
Your way of thinking is wrong because after you earn a profit either with your other investments or from faucet amount that money is your money. To earn that profit either you had risked your money or wasted your time so don't think that if you lose that money, then you're safe. Still, your the loser of something so just always gamble with some small fixed amount and enjoy the game.