How can it not realisctic? If you have enough balance to cover your loss I guess you can earn it. 1btc each day for a month I guess that is possible for some rich people. But most of them are like to push their luck to far to earn more thats why they end up losing. I ever saw people winning 100btc in just a day and I thought it is not possible but the truth there are people that win it and you can't deny it