Marketplace page - global products?

Hi! I'm wondering if the Marketplace page is supposed to display global products? It's just that it's not for me. I have my main site - http://www.clothncraft.com.au/home (it's a testing site) and a number of subsites (you can see a list here (http://www.clothncraft.com.au/home/blogs/). Post sites have a test product listed but these don't appear on the Marketplace dynamic Marketpress page.

Any ideas? I'm aiming to get something similar to http://fondelifair.com/marketplace Has it been specially coded or is something like that built in? Thanks!

Ok, so I'm thinking it might have been because the products weren't in categories and I've now listed them in categories however, is it possible to have the marketplace page to display products rather than categories?