Very true. He did it with Slingerland when he left Pearl in the early 90's. They folded and he scrambled to Mapex. That was when it was common knowledge that they were paying artist well to help the companies image along. Portnoy and Bozzio were with them for a short while.
As for artist relations, I have seen those guys drop the ball a few times and lose big name artist and they could have kept them. I don't know if it was laziness or arrogance.