Here's one thing you can do if you want to use them on other sites.
Overstock, Blujay, Yahoo (which is closing June 07)...any site that allows you to use your own html. (Not ecrater)
View your listing, use the button to get html, copy and paste into Overstock, Blujay, etc etc etc.
I've been asking Auctiva for years to make the means available for the stores to be used on our own domains outside of eBay.
Even though ecrater is free, there's no html, no personalization.
My suggestion has always been, Auctiva could do this for a fee and I'd be happy to pay.
Auctiva Jeff can answer your questions on private/public.