Always possible, there are lot of people who won from this site , but lot of people are losing too. Don't afraid with fairness of this site, since it has running for long time even though the owner has changed.
Exeperience? I have turned 10k bits deposit to 20k bits and withdrew, but few days later i lose it all,  .
On here, our money called bit, and 1 bit = 100 satoshis, so 1,000,000 bits = 1 bitcoin