Once you have a house/property, and all the general big things you dreamed of as a kid, I'd say anything after that. You will just keep wanting more and spending more. It's human nature to never think "it's enough". Always want more. Basically how corporations work too. They always want more. The bigger they get, the worse they are in terms of product quality, customer service, employee treatment, waste, legal issues etc.
My dream as a kid was pretty much that, to be on my own and own a house. I'm there now. I don't even care about the idea of having a brand new car, I'm happy with used. I don't really need a skidoo or boat or any other big toy. If I had lots more money sure I would get those things, but I don't really need them.