Anonymous predictions are useless if you don't allow transactions with 0 confirmation. I tried several times anonymous predictions (without account)...for 1 confirmation (with fee) I have to wait 2-6 hours or even more. After this time my event is over and btc come back -0.5 mBTC (flow into your pocket). Having account is the same, waiting 3 hours and not see anything, my event is about to start and I can't put a bet.
I know it's not your problem these problems with confirmations, but as sportsbook you should allow 0 confirmation like bitpay, directbet, bitzino,...hundreds of other sites. Cashout only with 1 confirmation of deposit. Simple solution.
Payments should be instant. Slow payments don't attract people (especially gamblers) to you. Most of gamblers play quickly, under the influence of emotions. If the gambler can't bet quickly, it will go to the competition.
If you care about consumers, you will know what to do...
Thank you for your input. Let me explain. We are aware of these problems and trying to solve them. However, it is not as easy for us as for traditional bookmakers. Traditional bookmakers have no obligation towards anyone, as they take the counterparty risk of every bet themself. If a tx does not confirm they just void the bet and are fine. If we match a bet on our exchange on the other hand we have to guarantee the matching party that we can provide the promised liquidity. There are attacking scenarios which cannot be completely ruled out, where a double spend attack could cause some serious damage. We therefore do not accept 0 confirmation tx at this time.
However we are working on a solution, where the majority of bets will be accepted even with 0 confirmations. These bets will have to meet certain requirements though (have a sufficient tx fee, be not too big at reasonable odds and some more). We will inform you here when we are ready with the implementation.
If you put 0.1mBTC as a fee the transaction will usually be in the next block.