In my opinion, they sell coins from the Bounty because they want to get money immediately.
I know that coin prices may not be as stable as their value, and while there is an opportunity to sell coins, they sell their coins to get money that is higher in value.
Yes, because not everyone already has money and is able to hold the coins they have, especially for paid hunters who are actually people who work on a project, unlike investors who basically have a lot of money so it's no wonder there are a lot of prize hunters who are in a hurry to sell their coins even though the coin has a chance to have a higher price