Buying a $3000 worth TITAN V is the best example of a mining idiot who doesn't deserve to ROI. I don't really understand the logic behind why people buy those but i'm guessing they already have a lot of money to begin with. People with less money rarely have the luxury of making stupid decisions like that.
If i had a lot of money, i'd have rather spent it wisely or donated it to charity.

at that time vega, gtx 1080ti were being sold for $1500, so for them even though titan v was $3000, it was cheap and a titan v was giving 7 usd per day, if we think about, at current profitability, anybody buying a rx 580 for $300 right now for mining is pretty much buying a titan v for 3000 usd at that time, 3000 / 7 = 430 days + electricity = 450 days give or take, right now a rx 580 is giving $0.30, so 300 / 0.30 with electricity included = 1000 days, i guess buying a titan v was lot more stupid cause the profitability could not have sustained, right now yes and it will likely increase, a wise man once said, buying when it crashes, never when its all time high, anyway titan v at that time or rx 580 right now one at beginning, the other at the end, the middle is called a miners idiot spiral and when both meets, credit card is earning their money back hehe and the idiot is in sorrow, this reminds me of the gold rush hehe
Well, using a celeron or igpu or both to mine was a lot worse than buying a titan v for $3k hehe