Welcome Sharkster.
Before I tear into you, please make mine a tourine of Ciopino and a glass of Lambrusco.
Trade scenarios seldom come to fruition because it takes 2 teams to bring off the trade which, in turn means (a) each team has to want the other team's player, (b) has to be willing to give up the player that the other team wants, (c) depending on the contract clauses, sometimes each player has to be willing to approve the trade, and (d) it has to make sense value-wise and cap-wise. Add to this the fact that other teams may be vying for the same player and there's always the free agent option and things can get pretty tangled up.
Each trade, therefore, becomes unlikely and trying to pull off a series of trades in concert with one another becomes close to impossible.
It's easy for us fans to pull of this kind of maneuvering using our favorite Fantasy Football or Madden 2005 software. But we're talking real life here.
(Of course, I'm the guy who who observed that the likelihood of Norm Chow giving up his million dollar USC contract to make a lateral move into the pros was pretty slim).