Their lottery, you mean? Well, there are several speculations about FreeBitco.in lottery. Some people say that isn't legit, but there isn't any proof the lottery is rigged. What people say is that accounts with few tickets (low chance of winning in %) usually win the prize...
But I have seen people here on forum claiming they have already won the lottery prize.
It's up to you to believe it or not. I prefer to don't buy tickets, not because I think it's scam, but because it's a waste of money...
Anyway you always receive few tickets by using the faucet, if you have to win, you will win.