The tuition is purchased, the degree is earned, membership in a social group of Alumni requires participating in its support.
I see that I was remarkably unclear, even for me. What I mean is that if you go get your degree from Harvard, you are always entitled to it, without paying another cent. But if you are the type to fraternize with the administration, attend games and other events, and describe yourself as a "Harvard (Wo)Man" in the present tense, you probably ought to support it just as you would support any other type of club that has ongoing expenses.
I see that I was remarkably unclear, even for me. What I mean is that if you go get your degree from Harvard, you are always entitled to it, without paying another cent. But if you are the type to fraternize with the administration, attend games and other events, and describe yourself as a "Harvard (Wo)Man" in the present tense, you probably ought to support it just as you would support any other type of club that has ongoing expenses.