Marc Staal is NOT paid like a #1 defenseman, not many players are paid like a number 1 defenseman. Subban, Weber, Doughty, etc. are getting paid like #1 defensemen because they are. There's a handful of #1 defensemen in the NHL. McDonagh, Faulk, etc. are #2 defensemen. It's fair to say Staal is paid like a #2-3 defensemen but to say a #1 is asinine. Subban, Weber and Doughty all make above or exactly 7 million. Staal is not worth his contract but he's still a #4 defensemen. The Rangers would prefer to trade him because Skjei is better. He could be a #4 defenseman on teams in the NHL. He does NOT have negative value. You simply don't understand the situation and I doubt you watched much Rangers hockey this past year to even have a valid opinion.
On Clarkson, he isn't an NHL caliber player. He scored 30 goals once, cool. His next highest total is 17. He's had 30 points in the last 3 seasons. He's missed 102 games. Staal has 49 points. He's only missed 17 games. I mean, Christ, his only bad season was last year and the ending of it wasn't bad. His value is not negative.