CENTRA, as I know, a sepat price touched $ 4, even at that time many hunters held the coin wanting higher prices, but it did not change. The CEO just cheated on his own project, so this project became a scam that was widely reported.
On the other hand many are happy because they have sold the centra at a high price and even the hunters are a little disappointed because they cannot keep their promises.
As far as I know, the bounty manager of Centra cheated the participants by not paying them. Many participants were not paid on that project not because the project owner did not pay them but because the bounty manager hoards the token that is supposed to be for the participants.
No one can predict what ezactly bounty that will be successfull (in price), what we can go to research a project that at least not scam and will pay for all promotors. We don't know how much that token price worth.
So far, i just identify an legit project from easy stuff like check out their website, team (especially ceo profile) and whitepaper.
It is not that easy, don't just check them on their website, they should verify all the details especially the profile of the project team member through calling the company where they are working, or they are affiliated with. Aside from that, those achievements listed on their profile must be verified too. That is one of the best ways if the team and their profile are legit.
You are right, the bounty manager has become a scam and does not make payments to bounty hunter. If they made the payment, there would have been a lot of people who became rich when participating in this campaign, but unfortunately everything bad happened. And eventually the CEO of this project was arrested and put in jail