Quote - if they render it correctly, most of their users won't be able to duplicate said
render, thus forcing them to render using default settings.

Sorry, but that's nonsense. Nobody is forced to render product promos using default Poser lighting. If we did that, we'd never sell anything. I suspect the main reason that so many promo renders look less than stellar is that people just don't take the time to learn how to light a shot properly. It's not that hard, providing you can be bothered.