I find this method little hard to find campaigns. I scrolled through 3 pages of yahoo's posts and i see not any signatures campaigns or bounty campaigns to join. the thing is these people are also users of this forum not just managers. they do normal posts too.
I think best way is to just go to Services and join open campaigns . for bounties there is a section for bounties too. to join a good bounty just check which bounty token is listed in exchanges then join it.
I agree that's the easiest I'm already aware of the existence of this thread but I'm not using this thread to check the manager's managed bounty because it will be a waste of time checking the last posts since like you said they are part of a bounty campaign also and they need to complete their share of required posts, just check the service section it's the easiest, especially on weekends when they update the campaign they are managing.