I am still surprised to see Vettel leave Red Bull, currently they clearly are better than Ferrari.
Most likely more money is on the table but he surely must already have more than he or any future children could ever spend.
Skepticism can too easy of a game, but I have to wonder about the reasoning. I can't help but wonder about how Riccardo has out performed him this year, and this decision .
His four time legacy is better protected and he will be paired with or against Kimi. A truly great driver carrer , but he will be in his final F1 season with in a car that has been a struggle for him.
If Ferrari can't put Ferrari on top, then why should Vettel be expected to? legacy undamaged. If he does, well then he is the man who also had 4 WCs prior that could do what Alonso could not do.
It seems very convenient, and no worries about Riccardo who was faster in a car that can't keep up with Mercedes anyway.
Obviously the above paragraph is speculation. We probably will never know the full story, and the day to day interworkings that effect everyone on the team. But from the outside looking in, that's my opinion as uninformed as it is....
I think a lot more than a juicy $ contract is involved.