Never pay for picks from someone that claims to have fixed games. 99.9% of the time it's untrue. If they do have fixed games they aren't sharing. Another thing is if you put heavy money on a fixed game, depending on the jurisdiction, you may be investigated.
It's common sense that if someone has the insider information, why would he be giving away that information to others for small amount of money? Why doesn't he use that information and place the bet himself and win a considerable amount? There is no point begging people to get the insider betting info when you can make money yourself with that info, isn't?
So in most cases, it's just a scam. That person will give you the information but that would be a random guess, in case that bets gets win, he will claim to be a hero telling people his success story and if that bet turns opposite, you won't find that person anywhere.