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