Very interesting article.
I recently visited New York and spent a day at the Met. As a tech-employed American who can afford to do things like fly to New York for a week, $25 dollars seemed like an amazing deal. An unbelievable deal, really. $25 there and $25 at MOMA didn't really register against the overall expense of the trip.
They still have pay-what-you-can for people who live in New York or within a certain distance thereof.