I take part in campaigns for two months but didn't get cash our of them yet. I received tokens of few projects but some of them are not even on the exchange yet and some of them cost too little to sell them.
Just continue working mate, in time you will be able to participate in a successful campaign.
And just hold your bounty reward, who knows in the future the value will grow, remember that the market is very unpredictable.
The earnings totally depend on the bounty campaign we involved in, the legitimacy, and the campaign managers working behind it. Most of all, it's on the exerted effort, hardwork that is paid off. Other factors that make you earn from bounties could be the number of campaign you join and through advancement of the rank. You earn what you learn, so never stop gathering information and in improving skills.
The good thing of joining the bounty campaign is you earn while at the same time it also help you to improve your knowledge.
Bounty earning should be treated preciously, don't just dump it after you receive, think of the future of the project, if you believe then you should hold some.