Yes you can make good profit, but if you have a portion of income per week like $40 per week you can invest $10 in bitcoins. This will reduce your financial risk which is much more bearable than months.
It's good to invest but don't put your health at risk because you're investing for the future. If the "present" isn't well taken care of, who will look after the future? I said health in the sense that what will be set aside for weekly paycheck is likely not going to be enough. I don't know your nationality but I can tell you that $30 weekly won't do much for anyone in today's reality.