That economic "filter" no longer applies, but the traditions have 
a powerful inertia
- The engines of commercial scholarly content 
production are still strong
 - The engines are powered by consolidations and mergers and 
acquisitions, leading to demands for high returns
 - It is in the forprofits' interest to keep their own content (and 
others') an expensive commodity (viz. an enormous science publishing 
conglomerate)
 
 - This is not in the interests of librarians, scholars, or even 
nonprofit publishers
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