Hey hey, i would rate such an app as "- Yes it would be handy but not essential". Last time i used eBay on the go was to bid for my N9 (on my N79, that procedure was a pain in the ***) and i m very happy about it now. So it worked even on my old N79 but to have a dedicated app on the N9 is nice to have and one more reason to like this device even more!!
what about creating a html5 / tizme app for that ? maybe some are existing already ? -- http://rzr.online.fr/q/html5