A bounty Hunter is not an investor. He becomes an investor if he buys the token/coin. Most hunters will dump their token when they get paid and move over to another project. A bounty Hunter is a promoter, that is shilling a project to his own circle of influence.
There is difference between a bounty hunter and an investor. An investor earns money by investing his own money. A bounty hunter earns money by working for free. If a bounty hunter gets a token, he can sell it at any time because that token. T he did not buy with his own money, he can sell it at a profit for him. And an investor. Before selling any token he will sell it after much thought. Because he has invested his own money in the tokens.
What do you mean by working for free? A bounty hunter spends his time on tasks to fulfill the bounty's requirements, so he can be paid after all. There is time and effort invested on this activity, the same way an investor invests his money on a token or coin.
I believe the main difference between both categories is that investments are passive, so the person doesn't need to stay tuned all day long to make profit, while a bounty hunter will have to work on different tasks and social medias several hours of his day to get paid. Anyway, investments and bounty tasks involve risks of losing money for the people applying to them.