Quite new on freebitco.in, I never won any prize of the lottery.
The best I got on the roll waas a number between 9986 - 9993
I multiplied some satoshis too, and grew them a little bit, it can be quick... But be careful and don't risk all your satoshis in the game!
IMO freebitcoin design for who want to earn free bitcoin since there is impossible to achieve huge prize without doing anything.
But it's great to see their market because they can keep attract new and old player to keep visiting the site.
For me, it's not worth of your time !