I don't know what your pricing model will be, but might I suggest a way for users to create a one-off online store.

I have a lot of books I'd want to sell to my friends/networks, because they'll pay me more than Amazon or EBay. While a monthly subscription wouldn't be feasible for a user like me, I'd gladly fork over $10-20 to set up a one-time-use online store.

I really, really like it. Excellent work.