Fanfiction.Net is looking for 25 Beta readers:
October 12th, 2007 -- The site is looking for 25 volunteers to help test a new feature in development. We are looking for long time users of the site that are both active readers and writers. Interested parties must have an site account for at least 1 year and is knowledgeable to the world of beta-reading. If you qualify and are willing, please email firstname.lastname@example.org with "Tester Account" as the subject line.
So, do you think that picking out the errors in their notice is a deliberate test to see if the person qualifies or do they REALLY need betas?