if your problem is your cheap salary its better to invest in what you can afford in bitcoin..if you have time in trading to your work and you need to have income to increase your profit in a month just give a time for trading that cant affect to your job. and invest in the half of your salary to get more profit..
Well if he was single and no commitments investing with trading with half of his salary is not a bad idea however if things goes other way around would you risk it ? and most of the time there was no fast money in trading you have to wait maybe a month or a year before you could actually gain a good amoung of profit , the question is are you willing to take the risk ?