As I have noticed these days, when the ICO hasnt finished yet and the sale was still on going, the bounty tokens has already been distributed and also unlocked they sell it immediately on forkdelta or etherdelta for a much lower that ICO price, in which it could greatly disturb the sales in tokens. As for you the investor on that token, would you panic when you see that the tokens you own already selling at much lower price?
As far as I know, tokens are distributed gradually after ico is finished. Usually the token is distributed to investors after that, to the bounty participants. But if this happens, I will only hold it until the price rises again.