Although a wrong board, I'll give few things that I have learned about bounties over last couple years.
1) Most Ico/ieo bounties are usually trash
2) The bounties which require most work usually are the best (translation/content/signature). Most people go for social media bounties as it's easy to farm accounts there, that's why the pay is trash.
2) if you want to make surefire money with bounties, work hard on ranking up your account and do bounties in
services board.
3) if ico/ieo gives huge bonus, it will likely close it's doors soon.
4) avoid bounties which has annonymous teams.
5) Whatver project you work for, always check team work history on LinkedIn.