Why?, because its sourced?
If MGP were to burn to the ground half of the bourbon/whiskey you see on the shelves would disappear.
That being said Michters American Whiskey is pretty damned good.
MGP is a such an interesting business case. Because the fact is, they make a lot of good whiskey, with different profiles and character. The various labels coming out of there actually are (sometimes) distinct from one another.