There are two schools of thought on assets in the NHL.
one: get something for it, no matter what. You end up with more assets, but other general managers learn that when push comes to shove, you'll cave.
two: set your price, hold your ground, and don't back off of it. You'll lose more assets for nothing, but when the time comes for negotiations that matter in trades for more than a draft pick, you might have gained some respect that the asking price is the asking price and don't waste my time with less.
I don't know that there's a right or a wrong answer, it's just different styles of negotiation.