I picked some right, but it didn't give me any VC, anyone knows why??

I couldn't tell you as i didn't get them all right, and even missed picking one game altogether. smh; and got 60 VC.
cheers

Ahh, missed only one game, VC earned: 0. -.-

yeah not sure how they assign points for it, but once I got 80 VC, and another time I got a few right and got 0VC. I am assuming you need to get a high percentage of them correct to earn vc points. So far I have found that 5 minute games earn 250 points and 10 points if you win in exhibition games. MyTeam games are 250 + 100 if you win on rookie challenge. On pro challenge you get 250 + 200 if you win. I have not won a game on all star yet for MyTeam mode. Blacktop mode can earn VC as well offline and online. Association mode you can earn 750 VC for a 12 minute game. I think its the same for Exhibition games of 12 minute quarters. MyPlayer mode at the beginning is tough for earning VC. But now that my guy is upgraded I am getting between 100 to 240 per game for that mode as well. And you get bonuses when you hit the MyPlayer goals like a triple double, or 5 blocks, or a double double, or being the player of the game and stuff like that. The new mobile app for iphone and android are easy ways to earn VC when you are not near your xbox or playstation.

My problem is that I pick them and then don't finish the game, so I don't think they save. I've only done this one other time and know I got a couple right but didn't notice my VC change because I don't remember what it was to begin with. I think it's neat that they do this, making it more interactive. I remember other game that did stuff similar to this to keep you involved. It's neat.