It would be unethical to ask for money which they lost - bet is a bet, at least from where I am coming from.

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Roobet should pay yahoo his winning and no one can change my opinion.

$11000 is very bad way for gambling site to lose costumers, final line, it is -EV and it should be piece of cake for casino to get that money back. Not professional if you ask me, as I can see from this thread they already lost 2-3 potential costumers. Definitely not a good start.