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It's a close approximation of value.

Much closer than saying "I would sell this if I received a 50k offer."

It's worth what people are willing to pay for it. If people are willing to pay $50k then it is worth $50k. Of course it might have gone down in value since the offer.

That logic only works once an actual payment is made. Claiming you are willing to pay and actually paying are two very different things.

It has a lot of value for brands like Nike, Nokia, Netflix, Nordstrom... Or a News channel - @N is very attractive to advertise. I don't see any trouble selling it for more than that.