its all his decision LOL. Why are you getting angry about his decision to sell the coin ? Maybe he has invested when btx was a very low price and now he could use his gained money for better things ?
Many people are complaining with all the other people that are selling BTX right now, but they totally missing one fundamental point.. Always remember that the price was under 10$, under 5$ and also under 1$... so what's wrong, and why not selling now with 2-4-20x ROI? They/we bought BTX underpriced, if you/someone bought overpriced is just their fault.. this is how the market works as far as i now.. It is ok to take a lot of profit and not be greedy.
So who bought ethereum at 10$ was a idiot because before price was 1$?? what a idiotic discourse... I have bought at 2 at 10 and at 15$ and i don't sell now