Wonder how much of this is because some sites use it as a quick way to get content from another system rather than only for the user? For instance, I know quit

Wonder how much of this is because some sites use it as a quick way to get content from another system rather than only for the user? For instance, I know quite a few forums have RSS import functions, and quite a few CMS systems are set up to auto import content from an RSS feed (like say, an associated forum). In those cases, the system sometimes doesn't let the user customise the output of the RSS importer, but does let them set what content is in the RSS file. So admins will provide a preview so their forum doesn't end up with the entire article or vice versa.