It's comforting to see this many other people having the same issues I'm struggling with.  You spend so much time working on the bounty that you don't want it to be for nothing in the end.  When I first started, I tried a couple different bounties with differnt bounty managers.  I'm hoping over some time I'll be able to come up with a list of managers that seem to have a higher success rate. 

In the end though, it could really all be down to luck...  who knows!