Why must i pay a 400% - 500% higher price for an extended license item as for a standart license item ?

When i want to render a driving car in poser then i can use the standart license product.

When i want the same car drive in unity3d then i must use the extended license item.

For me are both uses are the same thing !!!

When i want to use the poser item in unity3d then i must pay a 400% to 500% higher price for a poser item who isn't unity3d polygon optimized and textured !
Then the only difference is the license.