It will be interesting to see how many people do end up winning, the stat about 7 times/people in 3 months is irrelevant as they weren't trying for the competition or for 5 pt gains, they peobably just happened to have a winning run which just so happened to get to 10 in a row during x period of time.
@Ross Spur - plenty of people will have done it for a punt - like a bet on a horse - put down £20 and if you don't end up winning its an acceptable "expense". I cant recall if £500 was the minimum for the competition, but even if a mere 200 clients lost £500 WS have the funds for the prize right there!
I find some of these ideas interesting from a marketing perspective.
SimpleTrader09 is right that it is not hard, however to do it consistently is the key, (outside the competition) inevitably losses have to be taken at some point, and so let winners run and cut losses short is what those 7 clients (10 in a row in 3 months) probably did.