I notice that certain sellers hide bidders Identity

[CherryBombs]

I have seen on several occasions that one seller in particular does this... I also noticed that the Item which was for sale came back up for auction and there was only 1 bid. Is there a reason in which a seller will do this

[bandaches]

I have seen on several occasions that one seller in particular does this... I also noticed that the Item which was for sale came back up for auction and there was only 1 bid. Is there a reason in which a seller will do this

Are you asking questions that you already know the answer?  Seems pretty clear to me that a seller would do this to make it even easier to shill his auctions not that ebay doesn't already make it easy.

[JasonLiebig]

I have seen on several occasions that one seller in particular does this... I also noticed that the Item which was for sale came back up for auction and there was only 1 bid. Is there a reason in which a seller will do this

Shilling is certainly a possible motivation.  I do know that my ability to strategically bid is undercut when I can't see what other bidders are involved.  Does that benefit the seller?  Maybe.  I can see me bidding higher, just to be safe, if I don't know the other players.  But I don't know. 

Is there a clear reason why you'd want your listing to be private, other than shilling the bids up?  Does have the bidders ID's private benefit the seller in some clear, consistent way?