Hm, I don`t actually know about what particular fbs bonuses you`re talking about. Currently, they don`t have any bonuses, only some promos, where you can win some prizes, by active trading. But, in case you`re talking about this bonus topic, as a whole, I think you can win by gaining additional trading experience, but cutting some risks associated with trading,, where your capital is required to be put at stakes. So, my final answer is the best use of fbs bonuses is for boosting your trading confidence.