I agree with the most of reply's in this OP, IMO, I believe that bounties are partly driven by luck and there is no guarantee in the end, But I also believe that good reputation bounty managers have also a contributing factor to that so-called luck. In this forum, there's a lot of good reputation bounty managers but sometimes even the good reputation bounty managers were also victimized by the unfaithful project team or owner so the risk is always high. Anyway just scroll the bounty section and hopefully, you can find any good bounty that can accept your rank. good luck.