Because if their fanbase is anything like ours, their fans would overreact to the news and find all sorts of reasons to hate the owner/gm/Larry "Smith" if he was refused the right to talk to another team.
He has taken a lot of shots at the Blazer organization over the years. I would be shocked if he left the Jazz for the Blazers. Like I said if he was unemployed then that would be a whole different situation, but he's not.