I went to a private school, and I do make an annual donation. I was really poor when I was in college, and never would have made it through without scholarships, tuition breaks and work-study jobs. I want those opportunities to be available to others.
Instead of remembering the few people who were overpaid and didn't care about students, I think about those who could make a lot more in the private sector but choose to help students instead - not just faculty, but staff people also. Those are the people who made a difference for me, and I am indebted to them for helping me to be successful.
I feel bad for those of you who say you wouldn't ever consider giving. I suspect you picked the wrong school.