I doubt you'll get the figures you seek, as I would think they are proprietary info. However, IMO, the gallery posts are a good indication of what is popular and what is not. If you look at the ratio of Victoria renders vs just about everything else you probably have a good idea of what's hot and what's not. 8-) I think you can also sort the marketplace by some criteria that would give you an idea of what the hottest products are at any given time.