À la carte charges are the way business is done on eBay, but not on the commons of Craigslist.

What part of "free" is difficult to understand?

Data collected by Nielsen/NetRatings show that eBay's page views in April 2005 grew by less than half a percentage point, compared with the previous April. At Craigslist, page views grew 130 percent in the same period. According to the company's data, its traffic is now about a fifth of eBay's. And the operational efficiencies are astounding: Craigslist has 18 employees; eBay has 8,800.