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To an extent, the price takes into account missing coins / lost keys. Not perfectly, because who knows if a wallet that has been dormant for 10 years is lost or hodl?
Saylor said recently that he planned to have his keys destroyed on his death, as his gift to every other coin holder by increasing the value of their coins proportionately.
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Saylor said recently that he planned to have his keys destroyed on his death
Depends on what they mean by "keys destroyed". Destroying what they think is the only copy of the private key or seed phrase does not irrevocably destroy the coins. But transferring the coins to an invalid address (where no corresponding private key can exist to be able to transfer them on) does "destroy" the coins.
The current estimate is that ~18% of coins in circulation have been "lost" to various degrees. So it's possible to just knock off this percentage from the "market cap" for a less inaccurate measure.
(I agree that the concept of a "market cap" is nebulous, but that doesn't stop it being used widely in the finance world even for normal stocks. Best not to fixate on it too much.)
I don't disagree with what you say, but it's sort of irrelevant to the point I was making - which is that the "market cap" includes coins that (almost certainly) cannot ever be moved or spent, and hence worrying about the market cap and what happens to the "money" when it goes to zero is rather pointless.