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.
There is no strategy in gambling. If it were some kind of strategy that would worked on chance games like the dice being discussed here a lot of people would be rich by now. This is just myth and it does not exist in reality. When you play in a casino if you want to have fun, before starting to play consider the money that you will play there already lost. If you by chance succeed and make some money be happy about it, if you lose than you had already prepared yourself for such scenario.