I see how people might look down on this practice, but I don't think it's as bad as all that. Chris works within the law and pays legitimate royalties to the right people for their cultivars. He does the name-change thing which I don't like either but it is legal and the real name is included on the tag. Misleading perhaps, but I don't call it stealing. Not stealing money anyway. Maybe stealing credit for cultivars not created by his own work.
Seems like you know already... 'Gold Nugget' is completely Chris's. It was a sport from a plant in his greenhouse so he owns it as much as anybody. Charging a high prices for it is also quite reasonable given the demand for this particular plant.