It's sounds like a VeRO infringement - a lot of businesses and trademark owners either object to having their product market share, image and price diluted on eBay. I recently had a slapped wrist under VeRO rules for selling my old TomTom satnav system - the software is only sold on a single user licence, therefore selling it second hand is against the terms of the purchasing agreement.
A lot of fashion and costmetic companies have strict distribution deals in place, and if their products end up on eBay they will often report them. The manufacturers have a duty to their distributors to ensure that any deal between them remains protected.
There is loads to read up on Vero so start here -
http://pages.ebay.com/help/tp/programs-vero-ov.html (US Site) or
http://pages.ebay.co.uk/vero/ (UK)