This negative voting is getting out of hand.
I suggest killing the weekly prizes until this can be fixed. As maybe its related to this, as these voters don't seem to have any other common reason why they are doing this.
Just because i don't think it's a bargain doesn't mean its a negative, in that case just DONT vote.
Negative votes were meant to indicate that something was fundamentally wrong with the deal. eg there is a better offer currently available, like with the iphone, or its spam as maybe in the case of 123inkjets, or the offer has a catch that's not explained or obvious like there is $5 postage cost on the free sample, not that the sample - as defined by it's name - SAMPLE, will induce you to buy.
I reacted to this by voting negative on one of the latest abusers of this, but then realised that those we very old posts, and that in itself was being negative also.
Voting negative isn't making a valuable contribution. At least the courtesy of telling someone why they thought the post rated a negative vote, thats a positive contribution in itself, rather than just pressing the negative vote.
One voter went to the trouble of indicating that they did this in error - to them I say thanks, anyone can make this mistake and an explanation in the comments helps everyone understand why.
Maybe negative voting is a privilege that comes with contribution, and/or even then only one negative vote a day or a week, so that it's used judiciously rather than "I don't like any free offers" ,"deals from Timbuktu" or something like that.
Alternatively maybe others could post a thread here recommending what should be posted and what shouldn't be posted, so we can all work together
I still think we need a little box to open up and ask why do you wish to make this a negative vote?