This topic is not old nor new in this industry of web design with its sister industry; blog design. That is why while part of the blogosphere was discussing; How much would you for a wordpress theme? at WPDesigner.com, it didn’t drove me into much of a discussion.
The debate of cost is as subjective as a design itself. Many people made of designers, consumers, marketers, managers and directors have their own take of this topic. This is one of the reasons I don’t believe in having a standard cost to my work. The only thing I truly believe is a minimum cost when I’m hired to do a project.