In my opinion, while Bitmain did not make the trend to reduce the cost of equipment for bitcoin mining, it is best to withdraw 12 bitcoins to fiat because $ 80,000 is a very good performance.
For me, i'd rather hold 12 Bitcoin in my wallet than converting it to cash, but your opinion is good though. I know i can do a lot with 12 Bitcoin but if i can able to hold it for few more years, i think i can have a very huge profit from it.