I also went to the bidcactus site through a survey company and I bought the small bidpack just to try it out. It didn't take long to notice that there were a few names which ALWAYS bid more for an item than the item was worth
One bidder in particular placed bids on 3 different $50 gift cards, bidding over $100 worth of bids on each card. The bidder did not win any of the cards. I can not believe that anyone would be that stupid to sit and keep bidding those amounts without winning.
I watched for a 2 hour period... came back after a couple hours and that same bidder was still going!
I suggest emailing your senator and representative suggesting these sites be investigated. I am sure in the present economy that some politician would love to be a hero by shutting these con artists down.