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?
when you follow an ico you must fully trust the ico, be careful when choosing ico that you follow, don't listen to others, believe in the research you are doing. if you trust ico then when the price decreases you won't panic.