Those statements show your lack of understanding about the economics of mining. The cost of growing corn may not be dependent on the price, but mining BTC is different. Unlike corn, the total amount of bitcoin that is mined is fixed at 1800 per day, and that number does not depend on the cost or the difficulty. Corn farmers can spend more to produce more corn, but if miners (as a whole) spend more, they do not increase the production of BTC. They simply increase the difficulty.
I agree that the cost of mining depends on the hash rate, but the hash rate depends on the price. Assuming that a miner is rational, they will increase their hash rate in order to take as much of the total BTC production as they can, but they will not pay more than the price of a bitcoin to mine a bitcoin. Thus, if the cost of mining a bitcoin is less than the price, a miner will increase their hash rate, and if the cost is higher they will stop mining. The overall effect is that if the cost of mining a bitcoin is less than the price, miners will increase their hash rates and raise the difficulty until the cost approaches the price, and if the cost of mining a bitcoin is greater than the price, the least efficient miners will stop mining and lower the difficulty until the cost of mining is below the price. There you have it. The cost of mining depends on the price.
My friend, this is a really difficult concept. It took me 6 months since Nov 2018 (a time I lost a hearty chunk o cash) to really grasp how miner efficiency upgrades can tank the bitcoin price. I even was an s9 miner in 2017. Now I am trying to make others aware of what I learned.
The total amount of bitcoin blocks mined is limited to 2016 per fortnight (1800btc/day). The competition to mine blocks is intense and, when the hash rate is growing, it keeps getting more intense. The bitcoin miners are on a treadmill that is continually going faster. The reason no one can mine on a CPU anymore is because the introduction of ASIC miners made it too difficult for a CPU to mine btc. The ASIC eradicated the CPU competition.
With the advent of more efficient ASIC miners they are eradicating previous generations of ASIC miners just like they eradicated CPU miners. When S9's originally came out they costed 2k/unit. After Nov 2018 an S9 costed as low as $200/unit. With the release of the new S17's it will make S9 mining completely obsolete just like CPU's.
If I could make a magical ASIC that could seize 100% market share of the hash power of the network for $100 and get free electricity. I could create bitcoins for near zero cost, and I could dump 1800 bitcoins per day on the markets for PURE profit until the price of bitcoin goes to near zero.
These new efficient machines will make it so their owners can make bitcoin for VERY low prices even at higher hash rates than now. When efficiencies are not able to be increased a higher hash rate means a high bitcoin price, but when efficiencies increase a higher hash rate does NOT mean a higher bitcoin price, and depending on the degree of efficiency upgrade it can and will incentivize new miners to tank the price for greater MARKET SHARE of the 1800 bitcoin.
If you are using a horse to pull a plow it may cost 3k for that horse and all you need to feed it is hay (or grass or whatever) it may cost 50$/bushel of corn. But if your neighbor gets a 200hp tractor to till his field he would get 200x more area and it may only cost him $5/bushel of corn. He will very quickly cost you out of the market by selling his corn for $10/bushel.
Accordingly, the people in the city that were buying corn futures based on your farm at $50/bushel will also be screwed when your neighbor starts dumping his $10/bushels on the market. Bitcoins are basically futures contracts on the bitcoin mining network. People are currently buying $7800 dollar bitcoin futures contracts, not knowing that your neighbor is gassing up his tractor RIGHT NOW.
I made a post on my site explaining the floor price better here:
https://www.amsinger.org/writingsI hope you find it interesting