Well - indeed we take a 0.5mBTC flat fee for transactions for the anonymous bets - but we DO mention it. The reasons we take a flat 0.5mBTC is because we can't know in advance how big the fee will be with floating transactions fees. So we decided the best way would be to set it a little bit higher. Also: registered user currently do not pay ANY transaction fees.
Regarding the cashout speed: We aim to be back to instant (less than 5min) as it used to be in the past month. Together with the latest "stress-test" of the Bitcoin network we are currently changing the cash out process to floating transaction fees and a better check for double spendings. So currently we have to do most transactions manually and this takes obviously more time.