The thing is they have so much money they can't buy enough. Even if all they do is consume, consume, consume they will still be trending upwards. In effect, every yacht has a negative price tag.
It bears the same hallmarks as any other addict: the next hit has to be even bigger than the last, and everyday enjoyments in life are practically invisible to them. Their drug of choice may be different, but the outcome on their life, relationships and society is largely the same.