I don't believe there are any wealthy alumni. My high school Queen of Peace was able to raise over 2 million on a go fund me page with many successful alumni donating. The attached link mentions how even the last fund raiser for SA did not do very much. Now it is official about the closing.
http://www.northjersey.com/story/sp...cision-day-looms-hurley-st-anthony/100025936/
I also went to QP, and even though we raised the money to keep the school open, it may be hard fight to keep school open long term. As mentioned other spots, these schools really need to build an endowment and keep growing the enrollment numbers. These schools really cannot survive with small enrollments, need to have at least 500+ students to survive. More students allow schools to offer more programs, both academic as well as social and sports. When I graduated in the 90's, QP was at around 1000 students. now currently in the 200-300 range.