There is something that bothers me with a few murchants. Not that your product that isn't top of the line, but because there are a few that make a black blackground with poor lighting on the subject. Some is so poor of lighting that I can't make out what the product looks like at all. I think Black background are a very excellent way to diplay your product. I can only speek for my self though. If I can't see the product, I won't buy. And I would hate to see a tallented merchant that put in the time that it takes to loose a sale that I or someone else might buy.

Here is a simple and easy way to get the lighting the way to show off your model.  You have 30 frames to work with. Frame one. Get your product what looks good in your preview mode and render it. It most probably won't be as good as you like. THEN: move to frame 2 Tweek your lighting from there on. Starting in Frame 1. use Constant keyframe in your interpolation Controls for every frame or you can use LInear. There won't be any movement that carrys over. Then you can go back over the 30 frames if that what it takes. but the good news is you don't have to save anything or put anything in your folders. All your lightings that you like are there on each key. 

I imagine that everyone that makes Poser models has at least Poser 6 and some Poser 7. What's good with these versions is you have ten examples of your rendered scenes all numbered. Delete the ones you don't like and slide the others over till you get what you are after. This doesn't only apply to merchants, this can apply to anyone wanting to make a good render. I do mostly animations, but I still use this system to get the lighting from scratch the way I want, then Im set. Hopes this helps.