I have sold all of my EOS, and it has earned me a lot of money. I like EOS, so if its price drops again, then I will buy it again. EOS is a potential coin.
Now very low price of EOS and I do not see any objective reasons to sell coins at such a low price. But I know a lot of people who use this moment and buy more EOS coins for their storage and expecting significant growth.
If you have participated in the EOS ico and there will be so many reasons to sell your eos especially you can try to buy back it again later consider the ico price of eos was around $1 and this time it's still traded 5x from the ico price. that makes sense for him to sell his EOS. i guess that's the point how he was selling his EOS.