Huh? They actually charge a hefty fee for publishing: http://www.plos.org/publish/pricing-policy/publication-fees/ http://www.plos.org/publish/pricing-policy/pu

Huh? They actually charge a hefty fee for publishing: http://www.plos.org/publish/pricing-policy/publication-fees/ http://www.plos.org/publish/pricing-policy/publication-fees/ The donations and open-access merchandise are a nice extra. They are turning fabulous profits (almost $3 million in 2010; $4 million in 2011 -- these are net profits), but, being a non-profit, must invest them back in the organization.