He is brave, well if he holds the coins he mines at a loss and then pumpers pump eth and he sells at 100% more hehe, he will pay off his electricity but is a gamble, right now he is playing a 100% game and he owns only 30%. I would not play a game which I have only 30% chance to win, trading buying and selling coins gives you 50% chance.
with the price of ETH it's more efficient to mine other coins with nvidia and then buy ETH - brings more profit in the end and you can get ~ twice ETH than you would do with mining
search for it
it's usually every 24h another one - yesterday i made e.g. with DAXX $ 7.5 per 1070 (mining 24h before diff exploded and selling at it's peak) - with ETH mining i would have made maybe $ 2.5 that 24h....