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
it was just total waste of effort and timeAltcoins bounty campaigns were not wasting your time.
You should carefully read their whitepaper and roadmap before deciding to join the bounty campaign and there will be more details about the project they will be working on in the future. Even you took part in couple of bounty campaigns without knowing their own project it sounds like you are wasting your time and you can't earn decent amount that worth for your work.