I own hundreds of previously owned domain names, and the traffic that comes into them is up for auction on eBay. This amounts to over 15,000 unique web visitors per day. Current high bid is $15.
http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=1307590595
http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=1307590595