Sometimes, it really is. But the hunters never drop coins just like that. If they see potential, they'll hold the coin.
Yes, agree with you, all bounty hunters have their own rating about projects that they are participated. So that, with really good projects, most of them will hold it and keep tracking it, they not sell it after those coins listed. And with the poof distributed too less for bounty about 0.5%-5%, coins that bounty hunters holding not enough to make "crash" of token price.