They were attracted to the teaching techniques of the school. So they donated to it.
As you know Scientology has spawned many behavioral insights and techniques. Not in some religious vein necessarily but in more of a technology or body of information and knowledge.
I spent 10 years in D.C. and while I was there I checked out Scientology too. It was more like a small college lecture approach in an old classy brownstone in D.C. I wasn't inspired to go any further but I know and have experienced some aspects of that technology in other programs like EST.