Holding the tokens also doesn't mean it will make you rich. Some tokens get abandon by the developers so it would be better to sell at a good price than be left hanging in the end.
As for me I donnot sell my bounty tokens immediately. I just deposit it to exchange and make on order on x2-x3 from current price, and just wait.
I don't think the real investors hate bounty dumpers . As you know the bounty is about 1%-5% of total coins or tokens released on market and if this project is good and safe, The bounty dumping is a good chance for all investors to get more cheap coins or tokens .