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.
I think not all manager have their Websites where they can automatically calculate stakes etc. Managing bounties on this platform is much better from the User point of view, because one can see everything in the spread sheet and can also ask for correction in case we see something is not properly updated.