VirtualTracy
Thunderbirds are GO!
Many vendors repackage and sell OpenOffice.org on CD or DVD as a convenience service for people who cannot download the binaries (for example because of a slow connection). If you look here http://distribution.openoffice.org/cdrom/ you will see that there are loads of vendors selling OpenOffice.org on CD and/or DVD.
This is a quote from El's link and if you read through the eBay items listing details, it pretty much has an identical spiel.
It's like as if your country has oil reserves offshore but those who have the rights to drill for it and pipe it back to their country end up selling it back to you ...