I don't see how eBay is a fair comparison because its competitive advantage is its strong network effect and established ratings/community. Imagine if management was satisfied with only 2% market share..
Where does MBA's versus engineers ever come up? Jobs' speech is about creating a competitive advantage by building a premium product and focusing on a specific user - something eBay doesn't have the freedom to do.
During the 2000s eBay increasingly focussed their business on the largest sellers, helping push the site from a many to many business to a more traditional fixed price eCommerce business. Along the way they forgot about the awesomeness of their tiny auction customers who liked the fun of both placing auctions and buying goods, and as a result the site 'lost it' for many. The right customer for eBay was not the big merchants but the masses.