At what level is one of these trades / signings "fine?"
If it starts: First few years of the contract the player performs well, team wins a buttload of games (that's an official term, by the way) and even pulls out a title.
And it ends: The team is on the hook for three to four years (long years) for huge money to a guy who can't stay on the field and no longer produces.
Take any GM in the league and tell them that signing [player x] will result in exactly one title in the next six years - no more, no less.
How many of them would have the slightest hesitation in signing that deal?