I personally have seen families split up on just about every flight I go on these days, so I would not put too much faith in that. That's why it was worth it to me to pay the 5 (I've wasted much more money on lots of things....$20 bucks for the 4 of us for peace of mind is a no brainer). When I picked out my seats, the seats available only started towards the back of the plane (about maybe 1/3 to 1/2 through and then all the way to the back). In that block, you could see seats that were already chosen, and not many were there for groups of more than 2 people to be together. It appeared to me that the first 13 or so rows were never available to pick from. So maybe, and this is a big maybe, I'm just surmising, that they hold certain areas for the people who have higher points, pay higher fares, etc in the front, and then fill in the gaps with the rest that don't pre-pick their seats. Really, how many people even know about this? If I didn't read these boards, I would have never known.