Another reason for Open Access

I've just learnt from one of my authors that Wiley want $130.00 for reproduction rights of a diagram in one of their journals - which is ridiculous.  I doubt if the authors even know about Wiley's charges and, in any event, they won't see a penny of it.  I'm doubtful whether Wiley are on secure legal grounds anyway.  What is the difference between quoting a paragraph of text (with due attribution) and quoting a diagram (with due attribution)?  Rest assured - if you want your diagrams, etc. to be used by others, so that they get wide publicity and citation, Information Research will not prevent it by charging!