> jjk166: You're falsely assuming a 1:1 ratio between calories and cost Give the guy some credit... No, clearly CGMthrowaway is not assuming that at all, it's purposly left out. The first sentence mentions "back of the envelope math" and makes it clear it's a rough order-of-magnitude estimate. Also it's in response to a statement about "wondering how you could get such a high impact overall". Also, also, the last sentence is "So it tracks, roughly. And we are not at the bottom yet."

It's perfectly fine for people to do rough estimates to understand a situation, especially in informal discussions. It not a dissertation for a Ph.D. or formal position paper.