I thought your daddy was like an Art of the Deal guy? Dak can ask for $40 mil a year because he'd get it if he hit the open market and the Cowboys have him, Zeke, and Amari Cooper to pay. The Cowboys have really put themselves in a bad place here because they can maintain Zeke's rights through the end of next season with his fifth-year option, but Cooper and Dak are free agents and the Cowboys only have one franchise tag.
So there's nothing at all nuts about Dak demanding that money as an opening point before he settles in at over $32 million a year.
Now, the Cowboys obviously shouldn't pay that amount to Dak but they probably will because he's so averagely good that he made Scott Linehan's shitty offense almost seem viable.
I too am displeased by the QB market for mediocre-to-average players compared to what the rest of the players are getting but there's nothing unusual in Dak's position.