Those who went with 480/580 at $400 USD will find their cards worth $100. Even if their GPU can make $6 a day for 66 day ROI, their value at risk is 75% of their upfront cost.
Those who went with 1080ti at $700, but make $7 a day has a 100 day ROI. However if crypto crashes 80% tomorrow, their cards are worth $600 at least. That's only 14% of their upfront cost, value at risk is way lower.
If a person can put $10K value at risk. He can buy $71K worth of 1080tis, or he can buy $13.3K worth of 580s. For the same amount of money RISKED (not in upfront capital), he gets much much more hash.
What was the date when those went with 480/580/1080ti?
ROI for me at .07 KWH today is 98 days according to nicehash, assumed 700 cost
1070 is 84 days with the same electric rate, with maybe half the hedge per dollar invested. edit - at 400 USD for one, which is obviously probably not what you scoop them for today
580 8gb at 300 is 76 days. But who is getting them at that price without a group buy? Probably no one