I think it depends on the number of participants of the bounty, if there are so much participants in one bounty, and if it takes month to finish the bounty, yes it is not worth it and wasting our time.

But bounty is good enough to do, because you dont need money to do that, and if you are lucky enough you can get a big bucks, i do a lot of bounties campaign, signature, a ton of social media, and many more.

So far it is worth it to do.