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.
Taking off $10 from weekly $40 pay would have been o be determined by your risk management level. I would rather prefer to invest with $5 and make room for an emergency funds savings with $5, it still leaves me with $30 either way but in this case there's a hedge as emergency funds which would help make the investor not to prematurely tamper with his portfolio in the long run should there be circumstances that is beyond the solution of $30.
Provided it's DCAing method of accumulation, the investor doesn't necessarily have to deduct a large percentage sum from his income. What's important isn't in the amount deducted for the weekly or monthly DCAing, but let it be something within our risk gage which we can tolerate.