Experience has taught me not to sell all, especially at a time like we've now with the bull run in place. The only time I can take all profit during this time is at token distribution and I see how massively the project is distributing 80% to 100% of their all. I don't just sell all and walk away. I sell all to find a way of buying back the dump. As speculators, we should always expect price dump at token distribution, whether it's airdropped, presale or regular; those who had tokens ahead usually dump to (sometimes) buy back. I've been using this buy back mechanism and it's really profitable.