I've pondered this before and this post has made me ponder it again. I like the addition of 'valuing time'. Thank you.
I think the problem is treating this like there is a single answer. There is context every time you make the 'should I pay someone to do this for me?' question that will change it quite often.
An example...Should I pay someone to clean my place? Normally the answer is 'no', because my place is small and relatively easy to clean. And perhaps more importantly, I'm not going to work more either way so how much I make for an hour of work is irrelevant. Paying someone to do something for me when it just gives me another hour of Netflix that I probably won't enjoy that much is really silly.
But maybe I have a hot date coming and, for whatever reason, I don't have time to clean my place....then it might be worth it. Or maybe I'm sick so laying like a lump has more value than the average hour of TV.
I'm not sure there is an answer to 'what is my time worth' because it is relative to the options I have at that time.