Mike's comment pretty much summarizes the argument Brooks Jensen made on this topic one or two issues ago in Lens Work, the PDF is available here; http://www.brooksjensenarts.com/What...%20Edition.pdf.
The notion of a limited edition is borrowed from lithographic print making where the number of copies is limited by the process. This is not true of photography, and hence is meaningless, unless you perhaps destroy the negative after making the last print of your "series".
His recommendation is to number and date each print, and make prints for sale according to demand. Collectors will have a way to know where a given print fits in the hierarchy, and will have the means to assign relative value to a given print.
Last time I checked, you can still by prints of Pepper 30 from Kim Westin. I don't think those prints have affected the value of the ones printed by Edward or Cole one cent.