In the bad old days of Poser, material settings were saved to the Pose library, and for some time after, people continued to do it, because, well, old habits die hard.  Technically, anything that doesn't load geometry is a pose, so you can - or could - save just about anything anywhere with the right file extension.  Whether this has changed with later versions, I don't know.  

Was a time when there was a hard coded limit on the number of folders per library, and subfolders weren't supported, either.  Compounding that, only one Runtime was allowed.  I know, it was silly, but there you go.  Consequently, Pose used to fill up rapidly, so people started shoving stuff into the Camera folder instead, since it was hardly used.

Anyhow, since those days are gone, it's considered good form to stick things where they should go; poses in Pose, lights in Lights, materials in Materials and so on, with none of that other malarkey.

Coppula eam se non posit acceptera jocularum.

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