It is strange to ask members to deposit some money, although that is their first time to deposit, allowing them to withdraw their winning from the contest. But if I were you, I will let go and not try to back to that site because a deposit of 0.025 btc today is too expensive because that will be worth $1,200. I will not do that, even for just 0.003 btc. Besides that, you win that money from the contest, so you do not lose any money unless you use your money to join in that contest and win the contest.