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I would never use cash to buy large amounts of cryptocurrency... In a lot of countries you pay fees proportional to the amount being transferred...
It's not like in my country, where wire transfers are free if the recipient is a registered company.

A lot of the large purchases are done OTC, that plus Michael Saylor even offered to give Elon the blue print of how to best get hundreds of millions or billions into bitcoin.

Pack zillion of cash in suitcase and keep laptop or mobile phone to make the Bitcoin transfer ;) That's how they do it on TV ;)