Exactly. Or like how come a psychic never wins the lottery. If they can read the future, they should know what numbers will be selected and pick the winning numbers everytime.
To the OP, I have had some friends do the betting advice sites and got worked over. They listened to the "experts" instead of going with their own research and gut, and worked over for a few hundred bucks. They soon quit after that, so to them it wasn't worth it.