Most of the bounty managers have their website in which they upload the bounties in which they manage and make it easy for the hunters to find the bounties they manage and easy accessible for hunters. But these managers don't do upload spreadsheet for hunters to see their stakes.
The bounty managers on Bitcointalk always have their spreadsheet shown to hunters and make them awear of the qualified people and the rejected hunters , but to find the bounty of some favourite bounty managers is not that easy.
There might be a thousands of ways of promotion which are been used by different types of the community. if you compare this forum, we have got thousands of enthusiasts here who would willingly participate in the bounty campaigns to promote their choose project for their individual benefits.
The bounties over here are much secured as well as open to the community as they are well listed with the rules and regulations, Spreedsheet updates and much more but if we consider any of the automated bounty, we might perhaps not see these detailed information in there. Automated bounties are been cheated by some bounty hunters as there is no one to keep an watch on the activities and the stakes are been automatically filled over there.