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You certainly have to account for it, but surely some consideration must be paid to the fact that most of these images are quite useless. I’ve probably generated 100s of midjounrey pictures myself, to very little benefit except seeing what it was capable of. If we treat these usages as equal to cover image for a blog, I don’t think it’s quite fair. Not to mention the actively harmful usages (CP, deep fakes etc).
I’d say the generated image for the blog and any other drawn or photographed image for the blog are equally worthy or worthless. You’re there to read the article, the imagery is entirely superfluous if it can be adequately replaced by a generated image.
If you’re talking about needing to generate 5 images to get one to use for the article then yes you’d sum their adjusted costs but those images you generated for funsies are still accounted for because they served their purpose.