You're absolutely right but there are a lot of Bitcoin millionaires (mostly early adpoters) who can still donate 10BTC to the forum but it rare though for them to do the donation. Wait a minute, the donation is even enough to participate and pay a maintenance cost in the
build a seastead which was once introduced by Theymos.
I do not think that there are a lot of Bitcoin Millionairs.
I would bet that there are less than 5 if any other than Satoshi (and even his amount of bitcoin are not sure that these expected 1 million belongs to him)
Not counting an exchange as these funds are only in custody to their customers (but sure not your keys, not your coins)