I know it was wrong but I just couldn't help myself. I wanted to see if it could be done (and to be honest, I wanted more $). I filled out a bug report afterwards explaining what I had done and have been waiting for the sky to fall since then..

Here's the lowdown:

I don't know how closely you've been following this prediction but last week I created a couple of extra accounts and gamed it. I simply created a few dummy accounts and purchased the stock to push the cashout yield higher. I then cashed out with my main account (followed by the dummy accounts) and then bought again with the main account (and then the dummy accounts). I'm not sure but I think I did this 3 times and within 10-20 minutes I had more than doubled my $.

The jumps in the odds were insane.. Just by dropping a few hundred thousand on the table I could push the odds between 10% and 60%..

This is simple stock market manipulation and -obviously, shouldn't be allowed. The thing is, I didn't really need to make bets with the dummy accounts. I could also have just posted 5-6 messages that could sway other bidders. I can imagine that the multiple betting can be detected and penalized, but how are you going to fix the second issue? (It's not easy, stock markets still haven't found a surefire way to detect this..)

A more logarithmic (?!) algorithm is a must in my opinion.. I didn't understand how the concept of time can be incorporated into this though..