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    I'd add every user of poser. In the end its those who use poser for various different things who drive the innovations.

Not necessarily  darth_poserus.  I think people do it for themselves because they want to achieve certain things or because they are challenged and have the capabilties and talent  But - and this is a big BUT-  they don't keep it to themselves like jealously guarded secrets but share it with the rest of us,  and they put up with being bombarded by follow-up questions and further pleas for help. 
Credit where credit is due :)

@ svdl I pretty well concur with your personal categories  but I'd add the most  prolific sharers  of  their labour of love as freebies,
and the ones who shared great add-ons that make the creative process that much easier and faster for us all  (Ie P3dO the Poser Browser by Yarp, given away for free all these years of its evolution - the creator of UVMapper etc.)

I don't know where we'd need to draw the line