Lots of personal information is gathered, used, and sold about you every day. But not here.
Cookies on this site are used for normal Drupal session authentication, web analytics tracking, and late night coding. Only in the latter case does milk often accompany cookies.
Drupaltees.com may use customer data for internal marketing and improvement of the site and product offerings and, perhaps, to send out some uplifting messages of goodwill and the like.