I think one of the saddest parts of this is probably the fact that they don't even need that percentage of money that they are saving by hiding it from taxes. In the grand scheme of things it isn't the difference between them being able to make a mortgage payment or living on the street. Maybe a mortgage payment for their fifth house somewhere...
What do you mean, everyone needs more!
I think for them, it is like a football game. They want to win crush their opponent. Unfortunately, their opponent is us, and we don't have pads or helmets.
That's the trap isn't it? Everyone always feels like they need more. I'd like to think I would reach a point where enough is enough, but I am human. You are likely right about it being like a game to them.