You are focusing on a single scenario of an individual double-spender. Why don&#x27;t you consider some other scenario, e.g. a hacker getting control of a major BitCoin mining facility to disrupt things just for a laugh? I&#x27;ve seen a lot of that happening.
There are tens of possible scenarios.
Mining capacity is highly centralized these days and that trend will likely develop further (see the subj). The mental model of &quot;one malicious node against all the honest nodes&quot; is totally bogus.<p>So far, my observation is that BitCoin can&#x27;t run cheaply on the reasons already mentioned. I will only buy your argument if you&#x27;ll show me a graph of power consumption vs turnover and it will happen to be sub-linear.