Different people, different mind, different opinion after reading your opinion i agreed with your some point but not every point. My thoght is if we get paid we are ready to work hard if you gives us tricky work no worry we will work if you paid a handsome amount. But if you gives us less work for less payment truely it harts. We are here to work so no problem gives us more work but should pay handsome amout.
Now the fact is there has a problem which is project strongness. If the project is not strong as much as need to be successful then no matter hows the task is easy or hard how much you get paid. It will be nothing.  So there is not a fault of bounty manager. Everything depends on project.