I don't agree with your point. It's part of the marketing efforts of ICO's, gaining exposure and attracting more potential investors. What's being said about bounty hunters selling off their gains once the token hits the exchanges can also be implied to normal ICO investors. It's not an issue with the bounty hunters, just different people have different objectives with their investments. In the end it's a part of the game.

If the project is successful the remaining investors will still see gains eventually. If you're not out to keep the coins for longer terms I suggest you to invest in projects with a working product.

Here's a good topic for finding suggestions of such projects: https://bitcointalk.org/index.php?topic=2451482.0