Worth and value are relative and subjective, so I reject your premise outright.
Your judgement of what sounds better or different is worthless to me, if sighted. I have no way of knowing that what you heard was real or all in your head. I have a life-time of experience knowing and judging what I hear and how I hear it. I have a little more to go by when using my own judgement, hence the increased worth ... to me only. Despite this, I still resort to blind testing, as I know my own limitations.
Yeah, but that everyone else's sighted impressions are worthless to you except your own, that tells something about you and really nothing about those impressions. Which worth is in those it's unknown. But you deem it worthless, well it's you.
Anyway why someone's blind impressions should mean more to you? What if that particular person is simply incompetent in discerning quality even when he listens it blindly? And what if blind listening disturbs the focus of that person because he bugs his own mind with various thoughts going through his head instead of focusing to listening to the music?
You overestimate blind listening impressions, at first place.
My or yours or anybody else's blind listening impressions are still subjective. They can still be inaccurate. They can still be even wrong. It can still be in your head.
Of course, your own listening impressions may have a worth to you, even in case they would hypothetically be objectively worthless. As you say, worth is subjective, so to you it the objective value of it doesn't necessarily even matter, if your own subjective opinion on them is different.