The number of bitcoin millionaires, previously estimated 930, decreased to 790 (-15%). Their combined wealth is 5.9M bitcoins, which is 50% of all bitcoins.
One thing isn't clear here, did the number decrease because some sold or because bitcoins declined in value? It might make more sense to just refer to the number of hodlers at each coin level rather than dollar level when tracking changes over time.
I mostly track the changes in coin levels, as you suggested.
The reason millionaires (defined as people owning bitcoins equivalent to purchasing power of $1 million) have a special place in my heart is that I believe they have the highest potential to become full-time bitcoin evangelists. So if the number of millionaires grows, the impact to the rest of the world will soon grow also.
Instead of seeing these 790 people with total bitcoin wealth of 5.9 million (USD 4.7 billion, $6M per pop) in a hostile way, we should embrace them, because they are every bit as crucial for bitcoin's success as the midsize holders and small holders, if not more. You can think of Bitcoin economy without millionaires - I would still be working and not posting here for example
