To use free earnings to gamble at FreeBitco.in isn't a good idea in my opinion. You will need to claim a lot until you have a decent bankroll to start gambling, unless you are very lucky and hit some nice prizes like 0.002-0.02 BTC.
It doesn't worth the risk to play with a small bankroll. You won't make much profit and you will be risking your money a lot with high house edge...
And then, all your progress claiming satoshis for days, weeks, months will be over. Better to let it generating passive income.
There is no guaranty that you will make money even if you play with either decent bankroll or huge bankroll because in this game you must need a luck to make money and particularly this site has got higher house edge 5% so your chances are even less.
If you just want to play this game for fun then it doesn't matter and you can play with any bankroll to spend your free time but not for making money.