Only when you dump your bitcoin below your buying price, that's the time you will lose. And even for let's say you hold but bitcoin price decrease, it doesn't literally you lose, only the value of it on fiat but on the positive note, you can expect that someday the price of it will increase without harming your wallet just to re-invest to cover the loss value.


No need to be specific, generally, YES people are re-investing especially for those who got wrecked. But that's not always the case, they also putting money to add some quantity of bitcoin on their stash.