Open Source was always the problem on Contentmanager.de (and so it is now on Contentmanager.net).
That comes from the strategy, the content is added to the database: The vendors themself have a login to add and edit the information. The editor staff does not (or very rare) add/edit product information.
Regards,
Joerg Dennis Krueger
jdk - The Content Management Architects.
www.jdk.de