Like luckybit said, in order to get into eBay we just need to create demand.
Think viral:
Begin to checkout, put an item in the cart, get stuck, request help from merchant, ask merchant if he accepts BitUSD, tell him you want to pay in BitUSD and it's cheaper for both of you, show him an on-ramp link, tell him you'll buy when he can accept it, rinse, repeat. There's a lot more potential for this on eBay than anywhere else
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What you are describing is an example of something that isn't real demand.
If people here really are naive enough to think that kickstarting adoption is is just a matter of "thinking big", then the target market should be taobao rather than eBay. BitUSD actually has a decent USP for international trade, AND the bitshares community is really big in China.
But in the end a decentralized solution loses most of its advantage when marketed to a centralized marketplace where everyone have to be in compliance anyway.