> Whether or not a piece of what looks like garbage abandoned on the street, might have some value, sentimental or other, is not a good reason to claim that this particular “X according to reason is valuable among (sic) others”, regardless of the value it might or might not have for me.

Perhaps, but this is other than the current scenario, which is where you have asserted: "it is not “valuable among others”."

Have you substantial evidence to support this assertion as being substantially more than merely a personal opinion?

> I am disagreeing with the OP’s general assertion of value.

And due to the manner in which you have done it, you have acquired a burden of proof.