There is no confusion. As Apple have stated, if you are running Tiger, you will have to buy the mac box set priced at $169.
"Upgrading from Mac OS X v10.4 Tiger.
If your Intel-based Mac is running Mac OS X v10.4 Tiger, purchase the Mac Box Set (when available), which is a single, affordable package that includes Mac OS X v10.6 Snow Leopard; iLife ’09, with the latest versions of iPhoto, iMovie, GarageBand, iWeb, and iDVD; and iWork ’09, Apple’s productivity suite for home and office including Pages, Numbers, and Keynote."