I would not advise anyone to use cryptocurrencies (Bitcoin or other) at online casinos. In order to make money, you would not only have to beat the casino odds (extremely unlikely), but you would also have to deal with the fluctuations in the value of of the coin itself, which may go up or down. If you treat it just as entertainment much like a video game, fully expecting to lose your money, then fine, but otherwise the outcome will most likely not be in your best interest.