One thing that will also be reassuring if we can keep making quality post more and more users that came here will likely to stay here and enjoy the benefit in which the forum has offers.
If the purpose to change the habit of bounty spammer became a good quality poster to atract people joining this forum, then 100% they will not want to do that. Because if more people joining this forum, obviously there's some % user only joining this forum to participate in bounty campaign and it will decrease their reward 
Bounty hunters doesn't care about scam project or managed by scam campaign manager, what they want is free coin. So you can't do much to stop it, if you find low quality post from spammer.... Report it to moderator.