And besides in every investments there is a risk and Since this is a Gambling site so be sure that you are engaging in a Risky environment.
But if you Get lucky and Blessed,Surely you won't regret the amount you may win.
According to the result of investment from OP, it wasn't really that attractive though, don't expect that it will double your money easily as there are some days that the site is not in profit although people say that they win all the time. Investing in casinos is just putting a deposit on the bank with few interest earn, but there's no risk in putting your money in the bank as it's insured, unlike in casinos bankroll.