Serenity seems good for you to join. Here is the link https://bitcointalksearch.org/topic/bounty-serenity-source-energy-on-the-go3-token-closed-5160764
Hopefully these 3 will be successful so it will add up to the increase of the marketcap and growth int he market in overall.
Also, I hope bounty hunting is still good these days as I heard it's not as good as before already.
Whether IEO or ICO both has a capability to give profit as long as their project has a potential to increase in the future.
And one these project that are good to join in are Invech, Localcoin, and Beacon try to check them out at the bounties.