What was your plan had this flopped and you only had a few sales by the time you had to start shipping items? could you have brought down to a per-unit basis? did you have an exit strategy if it didn't seem worth your time?
Paypal has a wonderful thing called a refund button. Had things not worked out, all I would have to do is hit that a few times and I'm right back where I started, with no loss except $8 and some time.
