indeed gift hunters are very influential on "dump coins", because most nbounty hunters always sell bounty tokens / coins that they have at low prices so that the price of coins becomes low. we as bounty hunters must know about this and start changing it.
You cannot just totally blame it on bounty participants because if we observe the number of coins received by the participants, it's only a little percentage compared to the investors. And you should also remember that not all the bounty participants would immediately sell their coins because there are others who would wait for the coin to go higher to sell. Maybe the ones who are selling more are the investors, those who bought at pre-sale because they have more bonuses so most probably even if the price is below ICO, they are still in profit.