I won the wireless keyboard mouse duo combo from Logitech a few years back. They were giving away like 3000 of them over so many hours.
The problem is I don't think they realized someone would sit and hit reload when it said "You didn't win" at the top. So without waiting for the rest of the page to reload I won 3 sets that way in about 25 minutes of hitting reload. I gave 2 sets away to people who were trying as well but kept losing.
I should feel bad that at my work place there were about 30 of us doing this same thing. I believe we had almost 80 of the keyboards mouse combos before it was over.
Would that count as rigged?