Lol you mean worst decision he ever made. ETH is past $1200.. unless he sold those cards for 5k each... hes kicking himself in the teeth for how much money he lost. You should cover his dental bill for all FUD you filled his head with causing him to sell
uh? He bought for $140 and sold for $500, to me it looks a fine deal, staying mining with it longer would never get him even close $500 profit with just 1 card. A rx 470 mining eth is giving miners right now $2.50 per day, so $500 divided by 2.50 = 200 days for him to break even, He made the right decision. You people who buy overpriced gpus are just making people who bought rx 470 for $140 to sell to you trolls for $500 hehe
Your math is horrendous. Try again. You said he sold in March 2017. Calculate the difficulty of ETH from then until now and how much ETH he would have accumulated mining for the past 10 months and multiply it by $1200. Youre friend is kicking himself in the teeth unless he does math like you in which case hes probably happy with a couple hundred bucks in his pocket.
If youre saying he had only one card, hes not a miner. Hes a guy with a PC who sold his video card.