If there is a reward, then it is very good, direct motivation for people to help the project become better.
Bounty is always a great way to advertise a project. I think that the ideal option in terms of price / quality.
It does not always give the bounty the result you want, in any case, marketing is a delicate matter, they need to be managed correctly.
Not professional marketers are involved in bounty, but ordinary people are very far from the concept of what is advertising.