This guy isn't really selling those domains. What these pathetic little creatures do is use the great amount of visitors that go to ebay to bring some traffic to their crappy sites. If you notice, there is a link to some fiveneoi.com website. So, this guy thinks "well, it would cost less to bring traffic to my site using ebay than using adwords or some other similar way, so I'll try that".
This is a traffic "tip" that has been propagated in all kind of forums, and newbies think it is great advice, when all they are really getting is totally untargeted visitors that hit the back button as soon as they get there.
You can see many newbies using this at ebay, for example, take a look at this auction:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=46687&item=5720333355&rd=1
This poor loser doesn't even know how to spell... and he is hoping that people will click on his link, and then click on one of the ads on the page.
Pathetic, I know, but newbies think this is a great and cheap way to bring traffic to their sites.