i have been looking at various threads on bounty manager and it seems the same names crop up pretty often.
Several campaign managers offer a bounty (say $100) to anyone who brings them a new campaign.
I've seen both good and bad campaign managers use this practice, so don't just rely on how many people recommend a certain person.
Check his/her own work: it's easy to check a spreadsheet with names in any existing campaign, and see if spammers get paid to spam, or get banned from the campaign.