We can add a "why" about Tyler Toffoli, Josh Anderson, Christian Dvorak, Mike Hoffman, Chris Wideman and Sami Niku. Why were they all released or traded by their respective organizations when they were successful?
The question is so worth asking because, if you think about it in depth, it's true that a team doesn't release a player for fun like that when he performs well. There is probably a little something in there somewhere... Think about it!