Many people do not understand offer and demand, how it really works.
If all bounty hunters would like to sell all their tokens (2% of total supply) it is a huge selling pressure. If there are not enough buyers, price is going down until encounters buy orders. And as you can guess, noone wants to buy ICO coins just after the ICO sale because those who wanted buy, they already bought.
Your point of view?

Well, it's kinda true bounty sometimes cause huge price dump but only when the project is offering a huge amount of tokens as a bounty reward.
From what I notice about 70-80% of participate dump their token as soon as they receive the bounty rewards.