I want to try and if losing my balance refunded it is good. but If scam well it only 0.0025 btc
You want to buy his prediction while he has no valid history/proofs of his own prediction? Come on dude, dont be stupid although it is only 0.0025btc. And there is no guarantee that you will get your money back if the prediction is a lost.
yes you are right, he does not have a history of gambling tipster. supposedly before he sell pick. he should make a statistical free pick with a good win, like Joca.