It is necessary to choose the bounty very carefully. I'm looking for all the information about the project. Social networks and I read white paper. I look at Linkedin, the profiles of the founders of the project, their previous experience. It takes a long time, but it's better than disappointment later.
That's right, choosing the right bounty is good for deciding on a 50% chance of winning. You need to have the skills to pick the bounty that is right for you and perform all possible campaigns to get the highest rewards.