Blog posts about eBay not specific to SEO.

General eBay Posts
The Pitfalls of Ignoring eBay’s Level Playing Field
eBay has created an environment in which it is possible for the smallest of sellers, at least in some instances, to compete against those with more experience, more inventory, and more resources. In spite of the significant exceptions, eBay still continues to provide a “level playing field” for sellers of all sizes. […]