It is quite likely for regular people there are various points in which we have enough and/or more than enough for our own consumption needs and/or the needs of our family to support the standard of living that we want, including even increases that we might want in our standard of living.
Saylor/MSTR seems to be trying to prove some other point and seems to be employing a kind of game theory to taunt other companies into following his lead in terms of employing various means to accumulate more and more bitcoin. It does seem that Saylor/MSTR does create some central points of failure, yet even if he were to get 5 million bitcoin (which would be 25% of all of the bitcoin, I doubt that he has more power over the network even though he has more purchasing power and other kinds of ways of expressing power in the real world in terms of having a lot of wealth.
It does seem to be way more in reach as a possibility that he might be able to accumulate 1,000,000 bitcoin, but getting to 5,000,000 might be a lot more difficult, since other folks are also going to want bitcoin and to bid up the price of bitcoin along the way of his ongoingly wanting to acquire bitcoin.
Just in today's dollars terms, I have made quite a few posts in recent times, that if a person is wanting to have a sustainable income of $6k to $7k per month, then he couthan ld get started with that kind of a withdrawal rate at merely having slightly less than 20 BTC, and sure having a bit more bitcoin for a cushion does not hurt, yet many of us might want to consider what is the level of sustainable income that we want, and we can aim to achieve that number of bitcoin, including that the number of bitcoin needed is ongoingly going down for the same kinds of real world needs, in spite of the debasement of the dollar and other fiat currencies, bitcoin is going up faster than such debasement and faster than any other assets and/or currencies.
There could be various ways to attempt to cushion that you have enough BTC before stopping accumulation of it and beginning to withdraw it, including that the person who feels they need 20 BTC might wait until he has 40 BTC before starting to withdraw or perhaps just to either withdraw at lower rates or to wait a bit of time before starting to withdraw and the BTC value is likely to continue to go up with the passage of time as it has done historically, and surely I like to use the 200-WMA rather than spot price to valuate BTC holdings in order to NOT get too lured into over optimism that might come from overly focusing on BTC spot prices...even though BTC will be sold at spot prices, BTC spot prices are not very reliable for considering base and/or conservative measures of value to assure that you don't start to withdraw too much BTC from your BTC holdings too soon.
Saylor seems to be pretty creative in his employment of strategies, so surely he might want to be a bank to the extent that he does not end up becoming an object of national security. We will have to see one leg of the journey at a time, and even his late October announcement of acquiring $42 billion in bitcoin in the next 3 years seems to have had been an understatement in regards to how much bitcoin he and his company is going to be able to accumulate in the next 3 years, especially since in the past month or so since he made that announcement, they have acquired more than $10 billion in bitcoin, so they are well over a quarter of the way to their stated goal in only 1 month, and as long as investors keep throwing money at MSTR/Saylor, they are going to take it and buy bitcoin with it without overly concerning themselves in regards to the current BTC price.. I see Popkon6's post above says that they are half way to the $21 billion goal, which might be true.. and his post also says that they are changing (and increasing) the goal amounts... which sounds quite typical of a kind of understate and over deliver kind of approach in regards to how much the market (people in the market) seem to want to buy into various MSTR versions of their BTC accumulation strategy projects.