You are making a really good post here since I'm sure all want to know especially if it's a big amount. I went and asked Bitcoin-Betting to confirm. As far as the players are concerned, we are always getting the BTC price so we don't need to worry about conversions. If we deposit 1 BTC, 1 BTC shows in the account. If we withdraw that 1 BTC, we receive 1 BTC.
There is a .1 mBTC charge for BTC withdrawals. If you withdraw in ETH, then it's gas.
There is a .1 mBTC charge for BTC withdrawals. If you withdraw in ETH, then it's gas.