It seems to me that you have accepted alot of people, whom only post in bounty campaigns and have a low post quality (without any kind of contribution).
It's not too late too turn around and hire someone who is experienced on this forum to manage this campaign. I've seen many services get their reputation ruined because of horrible campaign managers who accept spammers into their campaigns. DT members are not known to like such behavior.
It's your reputation, and i just wanted to know what you might be facing here.
I don't see any member who seems be outright spammy . And if they were, they didn't have any sig attached to them before(because no campaign accepts spammy users now anyway) hence making the point moot("spam" posts without sig are not considered bad in the community).
Well if this user (whom got accepted) is not spamming and shitposting, i don't know who is:
https://bitcointalk.org/index.php?action=profile;u=1178512;sa=showPostsArchive:
https://archive.fo/RHmkSSome responsible manager (like yahoo or aTriz) would never accept such a poster into their campaign, and probably add them to their blacklist. This user is just an example of a poster who has made 0 contribution to the forum, and gets encouraged to spam even more because of getting paid for it.
This is the reason why merit system exists nowadays.
Edit: I have nothing against users participating in such things as long as they have shown some kind of contribution.