I'm starting to feel like a broken record saying this but it has nothing to do with skill it has everything to do with priorities and security. Sub categories and a pretty UI are nice features, are they essential? no. I get where you are coming from, believe me I do but a lot more goes into building this sit and making it secure than focusing on the functionality. The site launched when it was very primitive but we plan on sticking around for the long haul so have been concentrating on making sure we have the platform to do it. Check DPR's 'to do' list, all the things everyone is asking for are coming and some, you just need to be patient.