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
That is the risk of bounty campaigns. Sometimes you can earn lots of money and sometimes you can't earn for can of peanuts. it was just total waste of effort and timeIf you don't want to waste your time don't do long campaigns, wait for ICO to start and then join bounty. Read whitepaper, road map, do research about project and so on before you join bounty.