Let me qualify, I buy only Chinese coins, modern ones, and paper money from reputable sellers in such material. Ebay could in all probability, restrict listings from China going into the USA categories, but come on, really they are looking out for their immediate bottom line, and not long term customer satisfaction. They give some placation to farces like the new slab selling rules, but reality is they are more concerned about profit, keeping stockholders immediately happy than longterm goodwill.
But take into account, in all likelihood this describes many many American corporations, not just eBay. Compare them to say Japanese and Chinese companies that have 5-10 year plans, some Japanese firms have 100 year plans for sustainable growth. American companies plan as far out as the next stockholder meeting and dividend payout.