I suppose that to really be able to eBay ones chametz, it would be necessary to make the auction only open to non-Jews and I'm not sure that eBay would want to make that an option for their auction listings.
Kudos to the guy who decided to actually auction off his chametz this year because it was not only a funny idea that quickly circulated the Web, it was also a creative way to raise some money for the Ziv Tzedakah Fund - a great organization.
The Ziv Tzedakah Fund, founded and chaired by Danny Siegel, is about Mitzvahs - Fixing Up the World with whatever talents and resources we have as individuals.
Danny Siegel's Ziv Tzedakah Fund is a non-profit organization dedicated to the collection and distribution of funds to various little known Tzedakah projects. It provides money and support for individuals and programs that offer direct, significant, and immediate services with a minimum of overhead and bureaucracy. Ziv is also involved in bringing the educational message of Tzedakah to communities and Jewish schools throughout the United States, Canada and Israel and empowers ordinary people to become Mitzvah heroes.
I first met Danny Siegel back when I was in USY and he immediately endeared himself to me as an activist who cared so passionately for Judaism and for social justice. He's really a great guy who writes great books and runs a terrific organization. That is undoubtedly why it's important to donate the proceeds from auctioning off your chametz before Pesach to Ziv. That way you know your donation will be used to help make a difference in this word.