Bounty hunters would not be in a hurry to sell the received coins after listing, if all the projects were engaged in promoting not only the project, but also their own coins.
Perhaps you `re right. But this is only a guess.
How can a team promote their tokens? And why do they needs it?
A lot of depends from the price of the tokens. It price of tokens is rather good the bounty hunters may sell the tokens just to get someting. If price of tokens is small they may wait till the good time.