For some, a bounties can be a waste of time, a lot of projects do not pay because they did not collect investments or there were too many participants. From the choice of the project will depend on your attitude to the bounty.
It doesn't matter whether there are ton of participants in a campaign so long as you got some tokens and the team is working on its project to release their product I think the tokens you receive is worth more than what its current price. When you have the coins in your account, that means you have the chance to trade and let the tokens grow.