Look at brainboss also, alot his project also escrowed . by escrowing token reward atleast bounty hunter have certainity they will paid no matter how much its value in market while distributed. julerz, hhampuz , brainboss yahoo, irfanpak, bounty detectivenow be top bounty managers that care to their supporter. learn from previous mistake , escrow was obligation for each campaign.
Of the many bounty managers you mentioned, all of them have escrowing token rewards, but there are also projects that they hold fail in the market, but what makes the difference is that when the bounty ends, each manager has a responsibility in managing after the bounty ends, the most different is bountydetective, every project he manages always limits participants, both social media campaigns and signature campaigns
Limiting participants makes it possible to calculate the minimum amount we will earn from the campaign. In my opinion, this is a great idea and all managers should start doing it.
Escrow is an even better idea because it guarantees the payment of the reward.
The only risk the participant runs is that the project may fail, but this is never predictable.