The problem is that investors are not going to invest if there suddenly millions of tokens are dumped on the market. That would affect Steemhunts ability to trade in the future and every other Steem based token that follows.
Yes buyers will sell once they see the price go up...that is why they are buying in. Steemhunt has a responsibility (as do all token project) to protect the price of the token and leave the platform open for liquidity.
Again put yourself on the other side. You decide you like the Hunt project and buy in when the tokens go live. It is 2 cents but then, suddenly, another 150M worth of tokens show up on the sell board because the founders and other large holders decide to immediately cash out. How would you react seeing that the insiders were just profiteering off the backs of newer buyers? I am sure you would accuse them of manipulation and running a con (which would not be totally inaccurate).