Oh gawd, Dabs. You are both showing that you have no where close to 750BTC, and you seem to be creating some kind of artificial hypothetical that is not going to apply in terms of considering that someone who has 750 BTC would be the ONLY wealth that they have, so they have to engage in some kind of desperate reallocation, after a 50% BTC price drop...
Sure, there might be some legitimacy in your claim that the person had shaved off some BTC through an exchange after a 50% drop in price, but still seems quite presumptuous to be ascribing so many specifics.
I've never had more than 10k BTC, but having dealt with shitcoins in the past, the actual numbers themselves should "feel" the same whether you are transacting 1 BTC or 10 BTC or 100 BTC ... (since in shitcoin terms, I have experienced both receiving and sending 100k of them in their units.) I even had this shitcoin where I had close to 900 million of it (none of it bought, all mined, since it was a CPU mineable coin back then, so I wasted electricity on it maybe.)
I think without sounding presumptuous, the owner decided to move his coins after 9 years regardless of the drop in price, but maybe more so that it appreciated so many millions in the past 9 years, so that any actual value above say $10k is good enough for them. Or above $20k, as that was the previous top in 2017 to 2018-ish. $30k is still $10k higher than $20k.
Opsec. I lost all my bitcoins when my boat sank ...
or even below 1 BTC per address for some addresses, even though they might be more difficult to manage.. and even having equally sized addresses might not be any kind of strict requirement in keeping track... in terms of how many addresses to divide into and how much to keep in each.. some with larger quantities of BTC and some with smaller quantities of BTC.
1 BTC or even below 1 BTC might actually make sense. You can always use a computer program or software ... now we call that a wallet ... to keep track of all of it anyway. I think as long as the value of the BTC and it's potential transaction fee to transfer or move that coin from that address is below, say, for example 1%, then it's ok. Any smaller value might not make as much sense because you would be "wasting" your coins on transaction fees.
Moving 100 BTC with a 0.000002 BTC transaction fee is a very good number. Moving 1 BTC while paying 0.0001 BTC in fees, is also not bad, if you were to do that once a year, or even once a month.
If someone has 750 BTC currently (more than $22 million currently), I am not sure why there might be any need to strive to be frugal with $3 million of it.. again presuming that $22 million might be the total wealth.. which also comes off as a wee bit of a stretch as I already mentioned.
Some people have come onto wealth only to splurge and spend it all. We've all read the stories of lottery winners and even celebrities that made $300 million, only to go bankrupt because they spent it all in a short time without saving any for the future.
If someone did not have $3m before, it would be wise to make it last if that's what they cashed out.
I mean, completely changing your lifestyle might not be the best idea; upgrading it a little bit or getting rid of all your debts if you have any is much better.
Someone who had 750 BTC 9 years ago, while it is possible he has other wallets or addresses, it's also quite likely that's all he has as then even if he were a miner, or bought DCA before, it was normal to consolidate all those coins into one address because it was easy to do it.
Not many people had the foresight 9 years ago to mine a block of 50 BTC, then split them up into 50 different addresses, and do that often. It would have been such a hassle for something worth "cents".
Very few people carry more than a certain amount of cash in their physical wallets these days, or even 9 years ago. I don't know too many people who even had $750 in cash in their wallets. Most have debit cards, or credit cards, checks, apps on their phone, and maybe $100 in cash, in the wallet. Some don't have cash, just cards.