Your drawing method is not provably fair. As it is, you could have generated a secret that results in a particularly low MD5 hash for you some name (real or fake), and enter the contest later using an alt account.
I'm not saying that you would do anything so nefarious, but you need some element unknown to you to prove fairness. For example, you could use the hash of the first BTC block that is mined after the contest has officially ended.
That being said, this is a nice contest. Count me in.
You are quite right, I love this forum because there are people like you who are smart people and critical thinkers who speak their mind!
I really like your idea of using the first block to be generated after the promotion period. Since the contest is over halfway though and already has got a fair amount of entries, which have already been given their hash/tickets, I feel it would be unfair to change the rules now. Entrants can not be working for Brie Host or any of it's affiliates, and winners must agree to be announced publicly in order to win.
We will absolutely be using the first block after promotion period for the next promotion we run!
How should we describe this promotion? Provably fair (if you trust us)? Provably "fair"? Probably fair?
Our first rule/term/condition might help with the provable bit, since you will be able to speak to the winners yourself, as to ascertain if they are real winners or sock puppets

"You must consent to having your name or handle published on BrieHost.com, on our Twitter, and in the Forums. This is needed to prove the fairness of the promotion. You may choose not to consent however this will disqualify you from any prizes you have won"