Today's actual article processing fees (APF) of successful, established fully open access publishers supports this prediction of The Wellcome Trust. The profitable Hindawi charges fees closer to the low end of the range; for example, the APF for Hindawi's Economics Research International is $400. BioMedCentral's average APF is $1,640, in the middle of the range. PLoS fees range from $1,300 for PLoS ONE to $2,900 for PLoS Biology. This is just over the top of the Wellcome Trust range - but then seven years has intervened between the publication of the report and now.
BioMedCentral (2011). Frequently asked questions about BioMedCentral’s article-
processing charges. Retrieved November 22, 2011 from http://www.biomedcentral.com/info/authors/apcfaq
Hindawi (2011). Article processing charges. Retrieved November 22, 2011 from
Public Library of Science (2011). Publication fees. Retrieved November 22, 2011 from
Wellcome Trust. (2004). Costs and business models in scientific research publishing.
n.p.: The Wellcome Trust. Retrieved November 22, 2011 from http://www.wellcome.ac.uk/About-us/Publications/Reports/Biomedical-science/WTD003185.htm
This post is part of an early (not yet posted) draft of the economics chapter of my open thesis.