I see very little of that problem simply because I block automated submissions.
However, I run a worldwide site so I get a lot of non-native English speakers but require all submissions in English so translation tools will work properly for everyone since the translation tools aren't smart enough yet to translate mixed language pages.
Besides, I have all sorts of hooks in place so that we can tell when we're connecting with the customer and support is a very big component of my directory, we're friendly ;) <despite your initial impression of my general demeanor>, and we (more than me) talk to a lot of site/business owners on a daily basis.
Unlike most directories, you can even call us, we have our phone # and biz hours posted!
[edited by: incrediBILL at 1:58 am (utc) on May 20, 2009]