Actually yes you can do it, at least up to a point. eBay don't allow you to copy their database, although you can cache parts, eBay do allow you to display their content on your site with certain rules and TOS, and they'll even pay you for it as an affiliate!
see:
http://www.affiliates.ebay.com
Edit: Err, Sorry, I may have missed the point earlier, you want to make available a database of typical feedback responses gleaned from ebay?
Well, Ebay do make feedback information available via their API, there are restrictions in the TOS about what you can do with it, so you need to check. Also check out the ebay solutions directory to see the sort of thing they approve of.
http://cgi6.ebay.com/ws/eBayISAPI.dll?SolutionsDirectory