Don't forget that large numbers of private school students receive some form of tuition assistance. This is also true of "public" schools that charge, which is mostly at the post-secondary level.
>> Chuck: "least $150,000 in household income"
>>
>> [WS:] That does not strike me as very rich
>
> It's somewhere around the 90th percentile in the U.S.,
> and about the 95th in NYC. Not rich, but quite well off.
There are about 55M pre-K through 12 students in the US; about 6M of them are in private schools.
/jordan