This doesn't feel very trustworthy. I have no idea where these products are coming from and who is posting them. I can't even find an about or FAQ with more information. I realize it's probably very early but instilling trust should be priority 0, IMHO.
Looks like a very interesting product, made with my favorite to-learn technology these days: Meteor.
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Other than that, (And I think you're right about the trust thing @rrhoover ) I'd be interested in seeing whether you could use either virtual assistants or a scrape/hack combo to publish the products across the various P2P sales platforms at a higher price to leverage established distribution channels. I.E. When someone posts on the platform, can you auto-post to e-bay, craigslist, trademe etc?
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Gamamia