I'm not sure how it can be a feature when its not even related to SWSoft products, but a popular opensource spam fighter. Spam fighting should come as standard for anything in this day and age.
Heck, we had to pay $50 for coldfusion support, and all that the "support" does is add configuring options in the httpd.include's for coldfusion files.
Granted I can easily get around that by adding coldfusion serving web accounts to the main httpd.conf, but if its that easy, why charge for it in the first place...