It's not threshold. It's an average value. Threshold is a lot, lot lower, must be around 350K. The table say those in top 1% but not top 0.1% make $492,311 on a

It's not threshold. It's an average value. Threshold is a lot, lot lower, must be around 350K. The table say those in top 1% but not top 0.1% make $492,311 on average so clearly threshold of 1% is a lot lower than even that. No figure in your sources but my bet would be it's ~$350K