You might want to define an end-time to this contest (like tomorrow) so that it is not unfair to earlier contestants.
You are all welcome. Someone pointed out to me a flaw in the contest, where people who guess towards the end will have a better chance of winning. Therefore, all guesses made after I hit 991 posts (this will be 985) are disqualified. If you believe that is "not fair", then post your guess now and don't lose out.