Just a few years back WordPress was just one of the many CMS-s available and not so much different from the others. At that time it was nothing much to differentiate for those bold enough to go through the hops and use a CMS in their business.
During this year's Holiday Season WP List Mailer is doing a nice promotion of the new and much improved WP List Mailer ! Keep in mind we're talking here adding a discount to a super LOW starting price - WP List Mailer was sold for $297 !