I guess it is an almost impossible task for Ebay to police this, but they have to do more. I guess the fine they got recently in France might encourage this. See:
French court fines eBay for sale of counterfeit handbags ? The Register
I wonder how many of these are
fake Nintendos DS Lites
Personally, I would only buy from UK sellers because at least UK sellers risk jail for selling fakes which may put many off - hopefully.