One of the biggest issues I personally have with JN is that yeah, it covers all the ETS prices, but generally those are known. I feel like maybe a request system for the UB HTS might be a good idea, where if there is no updated price someone can request it to be price checked directly, and the people who can edit (For arguments sake lets say Offical clraik and up) can aadd a price based on their personal experience. The username of the person who price checked could be available as well, for reliability purposes/reputation.
Also, a NP to USD conversion, especially for the 100 mil + items. Obviously the rate for smaller ETS is 2$ per million, but for larger items a database of what they roughly sell for might be helpful.