I'm checking it on this website called "Bounties" and joining only a project that has potential and could give me profit by doing their task. I think some of the bounties i have joined is really great and gained some profit not that big but its okay to buy some altcoin that is cheap. I don't join bounties that only give 20 - 50 tokens. i'm not that desperate to earn that token if it is not worth it. It's a waste of time.