PCI DSS packages limit the amount of listings a subscribed client can submit.  Listings are companies, company products or company departments and depending on your pci dss subscription you are able to submit a certain amount of listings.  (I.E. If you have subscribed to a pci dss Platinum Package you can submit 20 company listings, e.g. Company A Product 1; Company A, Product 2; Company A, Department 1; Company A Department 2; etc.).  This allows for multiple listings within the pci dss categories and better indexing of your business. The result being  improved SEO and increased corporate exposure.