There are alternative ways to check if the bounty manager is good or not. First, check his/her recent projects, if he/she has a good success rate then he can be qualified as one of the best bounty managers. Why would you make another system about campaign if you can personally check his/her background on bounty managing.
I don't get it, do you really want to avoid spamming in threads or check if the bounty managers are qualified to handle a good campaign and gain a sure profit to them because they have the license?
We already know who the good campaign managers are. That's not the problem here. The problem is that anyone can be a campaign manager, and the people behind the funding of the advertising don't care who the bounty manager is, and whether there's spam or not. Okay, not entirely true. Some projects do tend to hire more trustworthy, and ethical managers, but the majority won't.