Mystic banana (cool name btw), thanks, really interesting post, loads to reply to. I fear my reply may be rather long, hopefully you’ll have patience with me.
No, but whether you were alive or not, what difference would it make to you, or to anyone else when they are dead (according to your beliefs)?
Once I am dead it won’t make any difference to me, because there will be no “me” to do any valuing. “I” won’t be able to value something any more than a rock can. That does not mean that what I value now doesn’t matter, it just means that it is not permanent. To me value is subjective, which makes sense if valuing something occurs in a mind…*
Incidentally I’m going to answer all your questions from my perspective since I think this is what you are asking about. I know you may and probably do have a different perspective. So I thought I’d preface with this paragraph rather than writing “from my point of view” at the start of each.
Hmmm - I can value a feather to be a million pounds, but does it make it a million pounds? It does not. I can think that happiness lies at the bottom of a bottle, but does it? Probably not. We can value things, but that in no way means they have that value to us.
Valuing something doesn’t change what it is. So no, simply valuing a feather as worth a million pounds to you would not transform it into a million pounds, or make it worth a million pounds to other people.*
However, I must disagree with regards to your last sentence. If I value something (to whatever measure of it’s worth), then that is it’s value to me. What else are you doing in valuing something. You cannot say “I value this feather at a million pounds but it doesn’t have that value to me.”. That sentence makes no sense. If you value something it has value to you. If you don’t value it, it has no value to you.
If you said that it doesn’t mean that the value I place on something is automatically the same as the value others place on it then I’d agree (you only need to consider items of sentimental value to see this demonstrated).*
Either these things have value to us or not. I can accumulate wealth - when I’m dead, what value has it?
The value of your wealth to other people will be quite high probably. However, once you are dead you won’t be able do do any valuing so “you” won’t value it at all. For that matter “you” won’t be.
Of course, while we are alive, these things can have value, but this value, for each of us, will reduce to zero upon death if we cease to exist as conscious beings - and the same is true for each other. Or is that ‘subjective’?
Agreed, once I’m dead I will no longer value anything. “I” will no longer exist to do any valuing. That does not mean that I cannot value something while I’m alive.*
Well, if any of the promises are true, we’re unlikely to have such short attention spans

*
But our experience of time and personal perspective are intimately tied to who and what we are as people. If “I” was going to live for eternity (either in heaven or hell), I would either have to become something different from what I know of or can imagine as me (so I would not be “me” in any way that I can conceive) or I suspect, eventually go bonkers.*
It still makes them pointless - your previous comments regarding subjective purpose make a farce of morality afterall! If we can invent whatever purposes we fancy, what kind of standard could conceivably regulate that? A standard of mood?
Afraid I don’t think I’m following you here, how does subjective measurement of value make a farce of morality?*
Peoples conception of value and indeed morality has been continuously changing throughout the ages. People once mostly thought confession under torture and burning at the stake, crucifixion, slavery etc (to name a few) were morally acceptable. People now mostly don’t. Peoples views on morality even change during their own lives, through changes of perspective, gaining understanding of others or equally through negative experience.
I guess you could argue that there is a set of “objective” moral standards, created by God which never change. But in practice human morality (to which you, me and everyone else contribute incidentally) does change from person to person and through time (which as far as I can see means it is subjective). That doesn’t mean that morality is a farce. You appear to be writing off all human applications of morality.
As for what standards can regulate it. Well in practice there are some axiomatic points in morality (as with any system) which serve as a practicably useful starting point for creating standards. For example “suffering is bad”. It’s based on the definition of “suffering” rather than any reasoned and justified position. If you wanted to change that then you’d need to redefine “suffering”, in which case another word would simply replace it.*
In any case the concepts of negative experience described by words like “suffering” and positive experience described by words like “happiness” provide practicably objective starting points for morality without need for reference to absolutes like God concepts.*
Anyway I’ve rambled a bit so I’ll leave it there for now. Kind regards