I have wondered something, and I noted someone mentioned trying to make SG look bad as a motive in the main thread. What if this was a kidnapping, valid ransom notes, but zero intention of returning NG. Maybe they wouldn't have even picked up the money had it been paid. How horrible would THAT be? You pay the money, no one touches it, you can't get it back and still don't have your mom?
So kidnapping for torture of the left behind. Just to be cruel. Maybe to make the family look bad, but not necessarily. I hope they checked SGs generic hate mail, if she had any, and any angry communications for the others.
If it had been a real kidnapping with intent to get the money, I just can't see sending the note to TMZ to make it a media circus. To me, that would nearly guarantee no payment. The only reason I could see sending it to any outlet is because if they left a note at the house, they had no way to ask, "Did you get the note I sent?"
Just another thought.