If you require bounty spammers to have a higher rank, they'll spam other boards to fill up 30 posts and earn Merit. Please keep them isolated on the bounty boards!
They need to receive merits to get higher ranks and that is not so easy if someone is shitposting spam everywhere, and they will certainly get reported sooner or later.
I would suggest members to spend they merits more carefully, but you can't force newbies to stay isolated in bounty boards, unless some rule change happens.
Aren't managers usually paid in BTC or some other already listed currency? Well, at least those with some reputation.
Most of them accept Bitcoin, but you can check their individual topic pages to see what coins they accept for payment.
I know for a fact that Lauda accepted bunch of shitcoins like Elrond and others for his work (along with Bitcoin), but he probably sold them all for Bitcoin or fiat later.
So getting them to pay everyone in an established coin will be nearly impossible. Also like others have stated, there are plenty of no named managers who will always take a campaign no matter what their payment method is.
Every merchandise finds it's buyer, and it's like cat and mouse game, trying to sell this tokens on time.
No name managers with shitty campaigns are attracting no name spammers, so they are almost living in parallel bitcointalk universe.
I think we should have some rating for managers, and people should generally avoid participating in any campaigns that don't pay at least partially in escrowed Bitcoin.