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?
Well any developer who distribute tokens to bounty hunters before the end of the token sale is probably not well informed about how things happen in crypto.
In most cases bounty tokens are distributed months after the token sale, because most bounty hunters are dumpers.
First few weeks of listing on exchange of any project is not always too good because pre sale investors do drop most of the bags and bonuses they acquire during the sale.