The jewelry thing is a mystery to me to be honest, 99% of the time i see those extremely samey, and very specific looking rings by the thousands, they look like they are coming from a ring generator script. But I just cannot see how that would come up as a need for anyone, to have complicated rings on a character that are of someone else's design. It is such a small item, and if is important, will be featured actually in focus, it will be designed from scratch for the project, not picked off the shelf. It is just overall not a good idea to try to sell highly project specific, or "design driven" for the lack of a better word (or my English) items , stuff that are clearly off someone else's project that had its clear distinct art direction. Buyers on sites like this mainly look for either exact replicas of existing popular characters or tools / vehicles, and customizable building blocks of again either characters or terrain/vehicles/machinery.
Yeah 3DE itself doesn't really do much for the popularity of each actual item, i suspect that those strange "link-only" 3d market place lookalikes, and individuals linking stuff on their blogs/social whatevers are the main driving force for any really well viewed items on here. Oh and Google, especially their image search. At least i tend to vision a clear connection between being at an elegant place on Google's image search and my biggest sellers.
To the outside 3DEs communication and PR looks absolutely dead i agree but believe me they have a real decent and competent support staff. With clearly not enough people, but i've always got my questions answered and my problems fixed within a couple days in the worst. At least they deal with inquiries in-house, eBay for example can shove their outsourced super Indian very script driven support system right up.
Tell me about it, 3d is getting easier to do / automatized & being outsourced to mid-Asia (by all means go Asian people woohoo, but not at 1/10th of the freakin price will you... that is just stupid) at a terrifying rate, i've had the exact same financial success with one superstar item (priced insanely) five years ago, as today with almost a hundred. Probably a good thing this is just one of the many pieces of iron i'm holding into the fire.