“Arguments concerning the opportunity cost of open access (giving away potential revenues, for example) are based less on specific examples than on hypothetical opportunities — “the magic app” — that frankly never materialise.”

— From The Problem of the Yellow Milkmaid: A business model perspective on open metadata (PDF), Europeana, 2011. (quote is from a case study about Yale University // an interview with Meg Bellinger, page 23)