Why not Ebay?
It’s true, ebay is ubiquitous! And if all you want to do is auction off a single item for which you have absolutely no audience within your community, eBay is a good place to seek a buyer. But, to address your needs with respect to community and member development, event creation and management tools, customer support and consultation, custom design, and privacy, you must use a custom platform. Period! Two examples: eBay does not share bidder information with you — all development and community building ambitions for your event go unrealized. Private and/or Password protected auctions are not supported. It’s the difference between ready-to-wear and couture!