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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/
If something isn't provably fair or if people do manage to figure out problems with the PVF system then once thats out, the site loses on a lot of players . People should always do their research before blindly trying out a new site. I doubt reputed site operators would pull any trick in the book just to cheat people , they would actually be losing a large chunk of their revenue by being fair.