It's just alien to our culture, isn't it? Speaking personally I went to a perfectly fine redbrick, then a better RG for a year. Enjoyed both, liked my courses, did some socialising, played some sport, all in all it was a fun few years and I got a good education. But I feel absolutely zero attachment to either institution, and I have no interest in supporting them now, 30 years later. No one I know does so either. So I think just saying we need to 'get with the program [sic]' and start giving back is to fundamentally misunderstand the British mindset.
@TizerorFizz's idea of a deep dive into which courses and institutions aren't delivering good value is a much more sensible suggestion.