Panarin tops off at about 30 goals. Skinner hits 40. 40 goal scorers are MUCH rarer than 30 goal scorers. Like it or not, finishing commands a premium and always has. There are two assists on nearly every goal, and the value for each goal is correspondingly higher in a contract negotiation. The team with the most goals wins hockey games, not the team with the most points.
I get that a bunch of people here absolutely hate Skinner and have no idea what kind of value he actually brings because they're so invested in the narrative they've created about how terrible he is, how he's a cancer, etc. But talent is on a bell curve, and the further out on the tail of a skill that you get, the faster the contract numbers increase. 40 goals is much, much rarer skill than 30. Panarin has a more rounded game, sure, but Skinner is much more talented than he is at scoring goals. Those things will likely cancel out and they'll get similar amounts.
Duchene is a 20-30 goal guy. Center, sure, and the assist numbers give him a higher point total, but in an average year he scores 23.2 goals. He's vastly inferior to Skinner in a major aspect of the game. Same with everyone on that list except for Point- who will easily land a $10+ contract when he hits UFA if he wants to.
Elite goal scorers cost money. Skinner is one of them. Don't think it's worth paying for one? Think it's better to invest in spreading the scoring through the lineup? Fine, but don't pretend that a 40 goal scorer getting a substantial contract is ridiculous. The best player in the league earns $12.5 million a year. Skinner earns 3.5 million dollars less than that. Wanna go nuts about a contract setting a ridiculous new ceiling? Talk to McDavid.