To use another post of mine from that 4 year old thread I mentioned before, I suggested something like this:

Quote - ReadMe
    Merchant  
        ProductName folder
            product readme files
Runtime
    Geometries
        Merchant
            ProductName
                product obj files
    Libraries
        Regular library folders
            Merchant
                ProductName
                    product files
                    AddOn folders*
    Textures
        Merchant
            ProductName
                product textures
                AddOn folders*
               
For the AddOn folders (marked by asterisks), what I mean are merchant addons to an existing product.  For example, if I made mats and textures for the Daz Morphing Fantasy Dress and sold them, my texture directory layout might look something like this:

    Pose
        MATs
            DAZ
                MorphingFantasyDress
                    KeithsAmazingMFD

    Textures
        DAZ
            Clothing (if organized like this, otherwise move stuff up a level by removing this one)
                MorphingFantasyDress
                    KeithsAmazingMFD

Doing it this way means it's a lot easier to find things.  I know all the MAT files from everyone making stuff for the MFD will be in the MFD directory structure.  If I want to move the dress from, say, the V3 runtime to a dedicated DAZ clothing runtime, it's easy to find all the files and the add-on products that I've bought.

 

At the time I suggested this, someone pointed out that they'd hate the structure the way I did it, and that's fair enough because that sort of thing was personal preference. What I was getting at, though, is that it isn't trying to create a folder structure that would make everyone happy, which is an impossibility, but one that's consistent, so that if and when I want to reorganize things to suit my preferences, I know where they can be found as a default in a newly unzipped/installed file.

The single biggest pain in the ass with the wildly individual structures in product distribution is the textures folder.