Since the predictions are made in public and ahead of time, and employees have no advance knowledge of the results, there is no reason to exclude employees from the competition.
I was surprised when I saw the very low number of events - combined with the fact that many events also have small fields and an even smaller number of contenders, getting a perfect score was not completely unrealistic, and the chance that at least one participant might get lucky was actually reasonably high. On the other hand, as you'd have to be crazy to insure a competition with these odds, now we know that LRC actually intend to pay for these contests from their own pockets. I think that's pretty cool.