Most autosubmitters simply list a bunch of popular DDL sites. They don't know the owners don't get users whitelisted. Meaning if you submit with them, you'll get a load of emails asking to add a backlink or your submissions just won't be accepted. Most submitters resolve this problem by forcing you to add a collection of buttons or links (meaning your footer becomes a link farm, a box full of link spam).
Exactly why quantity is useless in this type of site, quality is what is needed.
Exactly why quantity is useless in this type of site, quality is what is needed.