What I recall was that monero was the most profitable coin in 2017 with the vegas, a 10 ~ 20 usd per gpu. People actually took months before they spread the word how good those vegas were good for monero. Those vegas were being sold on ebay for almost 2k usd, even the rx 570 was being sold for almost 800 usd but at that time the rx 570 was new 14nm, right now the same rx 570 is being sold for 800 usd ehhe, insane. Welcome to teh world where people have more money than sense but they will learn after the crash.