Of course no one will sell their bitcoins when the value is dropping because they will only loose if they insist to do it however its still up to the person if he or she really needs cash badly . theres nothing really wrong in selling as long as you know that you will be geting a benefit with it .

In my case , i dont practice three things because my mind is already set for a long term goal . no matter what  happens , even if the price rise or fall i wont ever sell any of my bitcoins because i have a good plans for them on the future .