The Wikipedia article states: "One Proxibid auctioneers' website states, "At the request of the auction company, this auction permits bids to be placed by the seller or on the seller's behalf, even if such bids are placed solely for the purpose of increasing the bid."".
If you click on the source for that Wikipedia quote, it links to an auction site that no longer exists.
Ebay link states that bidding on the auction with another account is prohibited, as that's shill bidding.
Ebay does not make a statement regarding bidding with your own account, as that is physically impossible on the Ebay platform. Not explicitly forbidding it does not equal tacit permission.
I'm sorry, but this is feeble evidence. Regardless, we are dealing with Bitcointalk forum, and not Ebay or any other auction site, and the general consensus on this thread and others is that self bidding is shady behaviour.