No one here has touched on what i think is the reason for 10 cd's ... i mean 6. Copyright. If they can require six CD's then it's harder for someone to just copy all .iso's and share them. Well at least until someone makes a warez version combining everything into one file.
They may not be using all the space on all 6 disks, but considered that it was cheaper than really good copyright protection. And the fact they are using 6 disks just shows me that they should have used a better video encrytion method... they can't be using divx or xvid here...