If you are doing bounty program, there are 2 main options at the end of it:

1. The ICO is done, you will get your tokens within a short time.

2: It is a scam project and the people behind that will steal the invested money..There won't be any tokens, profit.

Even though if the project wasn't a scam one, your tokens can loose their value. Because the ICO isn't equal to the success of the company behind the ICO.
It can fall after the ICO, but it can be profitable too.. its almost 50-50% . It depends on the managers behind the ICO, on the idea, on the investors etc..

So if you are not sure about the future of the ICO, sell your tokens.