You would likely do well to read the first post in this thread as it gives you a pretty good idea of what is going on and how to earn points. All in all this is Sony's loyalty program similar to Disney Movie Rewards or My Coke Rewards - enter codes, get points, use points to get stuff. While a little annoying how they limit entry of codes, it is pretty easy to get a decent amount of points and they can be used in the Sony Store as well as through the rewards site.
I'm confused, I read the OP and don't see any of that mentioned. I recently purchased a PS Vita and a 2nd Ps3, are you saying I can get points for registering them?