Millionaires have their own ways to accumulate, and If its better to OP to hire someone who are into crypto and ask him to buy Bitcoin for him and ask for the best way to hold it. Millionaire people have to use their money wisely and they can easily hire good people to work with them, so I’m wondering why they are taking that too much risk on buying on their own without seeking a professional advise.
And they won't be asking any advice in the forum because they might just go and find someone to do that for them. But as long as you have money and resources, you can do everything that you want to do and with this, the possibility that it's going to be easy is very high. Although we advice that if someone wanting to buy huge amounts, just to go OTC or register to exchanges but you'll need to pass to kyc for the limits to go up on your trading account.
Also remember that people also know that the whole essence of bitcoin is being your own bank, handling things yourself without a third party. So even the millionaires are not happy that they have to pay people always and people will understand all about their finances. Who knows he wants to do things himself and maybe be anonymous.
Perhaps op's Satoshi text meant signed message to prove they have the coins? lol
How were you able to know that he was talking about signing message? Have you heard before where signing a message was referred to as Satoshi text?