Anyone that has put any effort in winning (5-10 bucks) something on my site has; you won't find any other penny auction sites offering low value products because they know that there may be only 3-4 people interested in that item and they can't get bidding wars going. That's why the big sites post ipads and iphone because everybody and their grandma want's one so you are guaranteed to have 100s of losers.
My site operates as a bartering exchange, post items you dont want, earn credits to bid on items you do want. You may pay 50 credits for 5000 credits; it's all about the strategy you use.
For instance, most "professional" bidders won't waste bidding on items with more than a minute left. High chance of just wasting bids on items more than a day out. There are also many other strategies bidders use; but it is about strategy and not luck.