Bounty can be quite profitable if the project you are working is a good project, and a bounty manager that is not a scammer. If these two are good, it can be profitable if you participate in more than one campaign. So yeah, it can be quite profitable.
Yes agree for one think' professional bounty manager not scam and they’re trying to find out best bounty always. After bounty ended If a project eco won't paid bounty token then we can't do anything. So we should research very carefully about project himself past of starting bounty work.