A somewhat brief article as unfortunately I have not left myself enough time to write a proper commentary on the subject: Microstock contributors are probably already aware of the thread at microstock group and 'movement' organized by boycottfotolia.org
The issue stems from photographer sentiment that devaluing of their work by Fotolias launch of 'dollar photo club' is something of a 'last straw' considering the license terms, image resolution etc provided. I can't really say I blame them considering Fotolias track record on transparency (or lack thereof).