If you really want to know, Lone Wolf Leonhart i'll tell you.
(SPOILER) Kratos does turn on you, but it's not for money, he has other motives.
The plot for me is very similar to FFX as well. A chosen one and her group of protectors visiting shrines to pray to save the world, as told by religious teachings. Someone having to sacrifice themselves for the good of everyone else. Someone else not agreeing with that, and finding another way, to save the world and keep the other person alive. If that isn't Final Fantasy X's plot copied, then what is! Alright there are other elements to the story, but the basic plot is the same as FFX.
As for predictable plot. I'll agree with that. I figured out something about Kratos in the first couple hours of the game, thats finally revealed in the last few hours, of the story.