We can't do anything about it it's their own rewards and token it's up to them whether they sell it or hold it bounty hunters earned it in the first place you can't make somebody tells what they about to do with their own belongings
Yes every bounty hunters has its own decisions whether to hold for long or sell the coins. We cannot force everyone to hold for long term the rewards they received. When a project is good it is best to hold so it is depends on project actually.