I understand math so I'm not playing, but it's really funny to think about. I don't quite get the motivation that gets exponentially more people to buy when the jackpot gets above $400 million, or in this case, $1 billion.
One of the reasons people who know math decide to play when the jackpot gets bigger is that at some point the game becomes a +EV (Expected Value). Not going into all of the math, but with the jackpot at 1.3B and with all of the other lower payouts, it is probably safe to say that the game is now +EV. I do understand the chances of winning the jackpot stays the same (very very remote) though. However to put a few unneeded dollars into a +EV game and to be able to dream a little, is worth it to me.