You've made yourself abundantly clear now (not that you weren't before, maybe it was just me). I think we've all experienced what you describe, looking at our own writings in a different way as time passes or reinterpreting them through the eyes of others. Heck, Kafka wanted his stuff burned, so what does that say about his ability to appreciate his own work! :p

You are maybe being practical about your market value theory, you have a sort of "it works better than other systems" capitalist approach, whereas mine resembles communism's effort to assign objective value to goods and services and we all know how that usually goes.

But what I'm saying is rather simple: Nietzsche's writings were good before the market decided they were good. If you kill everyone who likes Nietzsche's writings, his books would still be good ever if everyone now hates them. It's in this sense that I think it doesn't matter what the market says. Otherwise we'd have to say that 50 Shades of Grey or whatnot is a better book than Ecce Homo because it sold more copies (don't know if it did, I assume it did), or, to return to the topic of your post, that Taylor Swift is a better musician than Nina Simone.

That I can't stomach!

(No links to offer, but I guess this topic falls under the whole subjective vs objective debate. Pragmatists had this interesting theory that truth is what people of the future, or ideally informed citizens, will agree is truth. I've no doubt that if Taylor Swift fans are allowed to live long enough, they'll agree with me! People might even agree that science and philosophy are more interesting than football. Objectively! :p)