The whole point is that it isn't. Liquidity availability is big part of finance.

In your specific example of other side - yes - just because someone who needs to sell a chunk for reasons like an emergency, retirement or consumption needs doesn't mean they are happy to sell the rest of the chunks at that price.

Market based valuations only work in case of very high liquidity publicly traded assets and only if you don't own a significant %.

This makes your argument weaker, not stronger though. If there isn't liquidity market based valuation doesn't work.

>>This has been a fact for hundreds of thousands of years by now.

It isn't and never was. Liquidity was always big part of it.

You still argue like there aren't two sides to every transaction: A buyer and a seller. You're only talking about the sellers perspective as if the buyer side is something abstract and non-human. Do you think anybody would purchase anything for more than they think it's worth because of "liquidity"?