As a bargain shopper, along with what Rich said, yeah the older (pre-Genesis) content is pretty much almost nonexistent as far as smart content is concerned, so I end up having to go into the 'Poser format' folder to find most of that stuff. Which is annoying, because there were a lot of cool outfits made for V4, which you can often autofit to newer figures, with a bit of tweaking.
And, of course, MOST of the stuff from Renderosity doesn't have metadata...
Search will sometimes get me at least partway to a product. It may not give me the attachment, etc. but it'll bring up textures, which I can then right-click on to get the 'browse to directory' option, to figure out stuff about that texture - hopefully a PA and/or product name, and where it is in the directory structure, so that I can find the 'rest' of the stuff that I need for that product.
Yeah, you can take the time to categorize everything yourself, but if you have thousands of items...
I think someone was selling some 'metadata' related products on Renderosity, but I haven't looked closely at those, plus there's the 'paying for them' part that goes against my frugal nature... if I can find it on my own, and I'm on a budget so buying that instead vs some other shiny thing that I want... well I haven't made the leap of faith yet.