It's been a while since I looked at the thread and I am quite surprised how the poll turned out in the end. At the start the number of people who sold their signature earnings into fiat currency again was a very small. But now it is more than 60% of the people here who sell at least some of their signature earnings again. This might be related due to the high bitcoin price lately, but still there is so much room for bitcoins to improve. I would not sell any coins tight now. Gambling with our coins is fine because we can grow our crypto portfolio. But once we sell our coins we won't profit from any future appreciation.
I'm sometimes also tempted to sell any earnings made by signature campaigns. However, I've already made the same mistake in the past and now I regret it. I used to make a decent amount of Bitcoin (for current standards) and had sold a large proportion of it back in 2017.