Recently i took part in couple of bounty campaigns,and i though i can earn some decent amount through it...but it was a total waste...i took part in targetcoin and coss ico campaign and after 2-3 months i recieved the bounty which is worth only about 8 USD including both 
it was just total waste of effort and time
Make a research before participating in any campaign as we are not sure if project will succeed or fail sometimes as I observe success also depends on bounty manager if you join under a trusted manager there is a big chance it will succeed. it was just total waste of effort and time