I joined QuiBids last weekend and think it is a pretty cool site. I haven't made a killing, but have won a couple of things and did a "Buy it Now" on a Walmart Gift Card that I did not win (yes I had to pay a $1.99 service change, but that was better than losing the $$$'s that I used on bids). I figured the $2 was the cost of the entertainment.
There is tons of information available on the site, along with hints on how to make good decisions. They do advertise the best recent wins (they show you an IPAD that won for $3.54, not the one that was bid up to $111). The most important thing is to only bid on things that you really want or will be buying anyway.
My best suggestion is to start by bidding on gift cards to places that you frequent anyway and be willing to Buy It Now if you don't win.