I don't think that's the ideal indicator to determine whether a bounty is profitable or not. There is an old bounty that is profitable and not, as is the new bounty, it depends on which bounty we choose. What is the use of old bounty or new bounty if the reward distribution schedule is long? So, the important point is not there. Choose a bounty that gives greater effectiveness, both time, rules, and allocation. I prefer a bounty with a period that is not too long, working products and has been listed on the exchange.
I agree with you that most of the bounty campaigns of new projects are of no value. People want to make sure they get paid for joining, so a lot of people choose to participate in campaigns of active projects,