Who purchased bitcoins today?
1. Folks dollar cost averaging their average BTC cost down.
2. People who don't think it will go much lower and want to own.
As I posted earlier, BTC are the electronic equivalent to gold and diamonds. The value is in the eye of the beholder and price can fluctuate a lot.
In the BTC case, if the big miners are the ones who are selling because they must to keep mining, then we are seeing a forced liquidation that will squeeze them ever tighter. Be interesting to see what happens to the hash rate at $200 BTC price.
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In my opinion the forced liquidation would mostly squeeze out small miners. I am sure most big miners are not depending on monthly earnings to convert bitcoin to fiat to pay services or maintenance, if they did it's probably from previous earnings.