A significant amount of the acquisition budget of a typical university library is spent on subscriptions to scholarly journals  Over the last several years, the average subscription rate a library pays for such a journal has increased dramatically, even though the costs of publishing a scholarly journal have remained fairly constant
Obviously, then, in most cases publishing a scholarly journal must be much more profitable now than it was several years ago
Most subscribers to scholarly journals are individuals, not libraries, and the subscription rates for individuals have generally remained unchanged for the past several years.