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If you lose, wouldn't you like to know beyond a doubt that you fairly lost? Know if you were unlucky or fleeced. That's what provably fair allows you to do.
Provably fair does not necessarily mean provably fair.
When it comes to anonymous cyrpto currency in an unregulated gambling market, I'd expect numerous operators to pull every trick in the book to screw over people.
For example:
http://www.reddit.com/r/Bitcoin/comments/1frm4x/provably_fair_by_bitzino_not_provable_with/