Actually we the traders first of all have to make sure to take any kinds of bonuses from only regulated trading brokers, otherwise it is useless to have 100-200% bonuses which cannot use at all due to margin stop outs. By the way, I am very lucky to choose CIB FX which is regulated and for all time make sure 100% welcome bonus that is totally usable including lowest trading spreads as well as minimum margin requirements. So, my trading life is very much comfortable.