You can't deny the fact that they Yankees have the advantedge of bringing in new free agents, and retaining the players they bring up.
They paid Derek Jeter $19 million dollars. How many other teams have the luxury of doing that? Posada got $12 million, Rivera $10 million, Williams $15 million.
You think the A's could do this?
If a Yankee farm product doesn't work, they don't need keep him around. They can go replace the hole with a free agent. What if Joe Mauer doesn't develop for the Twins?