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Yeah I know where the contest button is, that has nothing to do with what I was talking about at all. I simply said "you guys used to had 0.2 btc, why is it 0.03 now" and that's it, knowing where the contest button is basically doesn't even remotely answer my question. About the other part, they used to do it weekly as well but just wasn't specific intervals, for example first few contests were all starting on Tuesday/Wednesday and they kept it up.
Can you, please tell me, where did you get those numbers from? From what I can see, the prize was 0.1 BTC in the very beginning of the WD wagering contest, and it is 0.012 BTC currently.
I think this last 30+ bitcoin one actually ended up rodolman at profit, so he both made quite few bitcoin profit AND got the free money as well on top of it. That is probably the only thing I can think of right now that caused them to stop giving away that much, otherwise the more people wager the better it should have been for them.
To be honest, I see little logic in this assumption. Big prizes attract more players, and more players means bigger profits for the site. If someone won a lot, by chance, making the site to lose some money, it doesn't mean they should stop doing what is profitable out of fear that it can happen again.