Dear old and tired,
In the Archdiocese of Washington, $10K for high school isn't out of line. My alma mater is near to the bottom in terms of tuition for Catholic high schools in the region, and is nearly $8K per year.
It isn't cheap.
Nonetheless, it's significantly less than any local public school system is costing at the high school level.
sitetest
Yikes! Those rates are sinful. Catholic school should not be out of reach of any student. Although not really cheap here in Philly, the average family, who may have to make a few sacrifices, can send their kids to Catholic school. High school may require the student to get a summer job to help pay tuition, but I don't think that's unreasonable. But $10,000! Outrageous! They are literally forcing committed Catholics to homeschool their children.