Some quite interesting stats of the cost of monetization with the ratio of scaling in different platforms.

But I’m not so sure, why it includes web servers (Nginx, Apache), languages (PHP) and web frameworks (Rails, Django, Mochiweb, Jetty) as a single group, doesn’t make sense.

http://journal.dedasys.com/2010/01/12/rough-estimates-of-the-dollar-cost-of-scaling-web-platforms-part-i