Experience actually speaks volume. You may make some mistakes at the beginning of choosing a good bounty, but as time goes on, you will get more of the strategies or better still, if you do not want it that way, choose your favourite managers and follow them.
This is an erroneous strategy. Open payments by your favorite managers and see how much you earned on average. I am deeply convinced that it is necessary to look for good ICO, the bounties of which are conducted by unknown managers.
List of good ICO can be found here