In what world does the price go down if a team doesn't need to trade a player? If a team doesn't need to trade a player the price for that player goes up, not down. If you don't feel the need to trade a player you don't make him cheap to other teams.
When the team is also "trying" to trade the player. He's worth a lot more to Buffalo than he would be elsewhere. It's gonna be hard to find him a new home in that case. It's like you're saying, "We want to trade him, but we're going to ask for way more than he's worth to you, because he's worth that much to us," without realizing other teams are going to respond, "Well, okay, then keep him."