I don't think either side does this. Subban is a great defenseman and Montreal would want massive overpayment before they even consider moving him. Even though they haven't signed him yet, they do not want to lose him.
As for the Sharks, Vlasic and Demers are key players in the Top 4 for the future, with Vlasic being Burns partner and Demers hopefully taking over for Boyle. I doubt they would want to jeopardize the team's future by trading both of them.
Those are my two favourite teams and I wouldn't do it from either perspective. MEL is perfect complement for San Jose's offensive defensemen, whereas Montreal needs PK's explosiveness and excitement. Demers has huge potential and is a major part of the Sharks future and Weber isn't needed. Vlasic just doesn't fit perfectly with Montreal and while Demers is nice, I'd prefer the risk-reward of Subban.
Neither side does it, however fair the value is. I love these teams equally, so I am unbiased.
Not a bad deal but the Sharks need Vlasic's defensive game far more than the offense upside Subban would provide. Had they not dealt for Burns, I could see this having greater interest from their perspective. Montreal would likely refuse either way. Too much potential in Subban to move him.
Good player but I don't think it's a good idea to have PK in our locker room. I'd pass
You won't be in the locker room. How about you ask Montreal players what they think of him in the locker room? Oh you mean you don't know what they think? Why don't you want him in Pittsburgh's locker room then?