I built a pay wall back in 1995 for the MIT Press, restricting access to some of their journals, e.g., Cell, to individual subscribers and people whose IP addresses indicated that they were at institutions with site-wide subscriptions. I can’t remember exactly what I charged the Press, but it was only a few days of work and I think the invoice worked out to approximately $40 million less than $40 million.
— Philip Greenspun’s Weblog » How did the New York Times manage to spend $40 million on its pay wall?
