Have to keep in mind...
Some people have mined BTC in the early days when 50 Bitcoins was distributed per BLOCK, as every 4 years passes the halving gets cut in half to 25 Bitcoins per BLOCK, and today we are at the 12.5 Bitcoins per block so you can imagine in 2020 it will be 6.25 Bitcoins per block.
Lets forget about the cost of electricity for the moment!
Factor on ALL those Bitcoins the early pioneers had when it was like pennies! Not EVERY early pioneer SOLD ALL their Bitcoins...They did NOT need to! Some even bought them from an exchange for less than $100. Not saying I am one of the early pioneers...But I might know a few...
Every STAGE (halving) you might want to ReThink how much you should be SELLING if you were ONE of those early pioneers...right?
Because if you SOLD ALL of your Bitcoins and have NONE left, you would be buying at today's price just like the NEWCOMERS that are paying 2K+ per Bitcoin...
You don't want to be that guy!
But if you are...please Buy in Thirds and Sell in Thirds and Rinse and Repeat so you don't fell like paying FULL PRICE or TAKE a LOSS!