That volatility will give you income if you know how to buy low and sell high, but no one could do that consistently.
I don't think it's good to aim for a weekly profit in trading since it is hard to achieve although it is possible. Let us be very positive
but still realistic, let's take it one step at a time, put a decent amount and earn from it.
We cannot expect bitcoin prices to go volatile all the times so that we can make use of them for out trading to get consistent income generation. As long as these fluctuations are random, we could never think about fixed income out of bitcoin trading. This is not an unique case with bitcoin trading, almost all trading instruments are behaving similar to this manner.
The only thing the traders can do all the time is just making use of the opportunities and waiting for another opportunity hence fixed is not at all possible.