Move this to the scam accusations board: https://bitcointalk.org/index.php?board=83.0

And provide further evidence, nobody will take you seriously unless you can actually prove you were scammed.

Also, if he genuinely is a tipster, unless he offers a moneyback guarantee you can't really complain. After all, a prediction is just a prediction whether from an expert or novice, surely he cannot see the future otherwise he wouldn't be selling the service.