This site is absolutely not a scam. I been with DD since 2012 and have won lots of nice items. Also love the daily free bids and that you are able to sent in a picture and get free bids. Shipping is always free.
Tip for consumers: If you first start, study the bidders first. Stay with your first auction and also check out on the left hand site of your bidder page who won and how many bids they put in and how much the total was for their item they won. You have bidders what want to win for sure and could as well just buy it. Again, study the bidder and make you a list. Hope you get a hang of it and good luck.