Comment by Veserv

Sure, there might be other theoretical concerns beyond just getting to “uneconomical”, but they are all basically irrelevant compared to the fundamental economical problem that you do not spend $1M to force the attacker to spend $10M, you spend $100M to make the attacker spend $1M. We need to start by improving systems by 10,000% to fix that problem before worrying about minutiae like relative willingness to pay.