There is no fixed monthly income in trading, to say that first, its hard to predict market and to have profit all the time, even harder to always have same high profit. Bitcoin and trading are two different worlds, trading is gambling and its full with surprises, you really need to be an expert to constantly generate profit, on other hand just buying and holding bitcoins can generate good profit with less risk. Bitcoin trading is capable of supporting traders to earn a living out of it still aiming for fixed income seem is not appropriate as per the nature of results we may expect on daily basis