Yes because it is a gambling site.  It would never be safe and never ever would be fair.  It is a game of luck.  Many of my friends play the bustabit game and they have strategies.  There are times that they really good with it and earned a good amount of bitcoin.  And there were a time that they regret the fact that they became greedy and should stop the game when they feel that they have to stop it.  Any ways, it still gambling so better to allot bitcoin that you are willing to loose.