As a Bounty hunter I once made a mistake by selling tokens from Bounty that I received in a small market for $ 250. After 20 days the price of tokens that I sell is worth $ 1200. So the conclusion if you want to wait you will get maximum results. Believe every ICO project will prepare a good market in the future.
It does depend a lot on which project you have tokens from. The sad truth is that most projects fail, which is why many bounty hunters sell their tokens as soon as they can.
What this says to me is that it is very important to take part in bounties from only the best projects - that way you can feel confident in holding onto your tokens long term, and confident that the project will succeed as token price will increase.