being a bounty hunter is not that easy. Sometimes you need to study or review first the ICO you're planning to join in to. It's a really bad feeling if the company you're advertising for 4-8 weeks would turn out to be a scam at the end, so choosing the right campaign would be the best thing to do.

For short term or immediate hunting, After finishing the bounty campaign for about 4-8 weeks you can instantly sell your token rewards for a quick money or:
go for the long term, after receiving the tokens you just hodl it for around a year or until the price skyrockets and expect bigger profit out of it.