in my opinion is to sell when you see the price is right and to hodl when it can't even replace the Gas price. mostly i do sell them because on that way you can get your bounty earnings by early.
Before, I used to sell my bounty reward token. It has a good value that time and it's nice earning. But after a few weeks in the market, the value becomes lower and lower. And I am happy and satisfied with my earning because of selling it right away.
Now that most coins in the market are losing its value, the most advisable things to do is to HODL and be patient. Market will recover soon.