I think even at this point some don't understand the difference between .mt5 and .mc6.

I also remember the Pose part of the library getting so full people started setting up texture files under camera settings before the material room appeared in Poser 5.

I also remember the insanity of having to include files that applied textures to Poser 4, Pro Pack, and Poser 5, else customers would be fuming across all forums because their version of choice was not covered.

So I'm assuming merchants are just trying to keep as many customers happy as possible.

Most of the time you can delete what you don't want to use, but most people don't know how add/make what's not there. Hope that makes sense.