I like the idea but I do have one immediate question:

We give you a unique link for each item you want to sell. You then can tweet, post, or share your link however you want. And as soon as your sales reach $10, we'll send over your earnings.

So if a user sells something and never reaches $10, is that essentially held in escrow forever? Is there any way for users to "cash out", so to speak, after a certain period of time?