seller with items advertised elsewhere

What is it with these people who put things on Ebay as an auction item with the disclaimer that it can be retracted at any time as it is 'advertised elsewhere'? From what I have seen the items are ususally listed on the 'other' site/s with an asking price, which has nothing to do with an auction type sale. 

I have been unfortunate enough for poor vendors to retract the already bid on item on ebay. Personally I think it is poor form. You either want to sell it at a set price or to auction it. I've never been to a clearing sale or acution where 1/2 way through the bidding the auctioneer simply says 'sorry folks, it's no longer for sale as the vendor just made a deal with someone else and sold this item off a newspaper ad.

Anyone else have an issue with this?