Most wealthy people in history have not been able to guarantee that their own children, let alone grandchildren or great-grandchildren, would continue on in wealth. To me, if you get rich, it's probably an awful idea to just give it to your kids, if you care about how they turn out at all.
It's just that you still don't want to hand over the money on a silver platter, it's better for people's character and pride to do some work to get it (e.g. build and sell a Ferrari to you)...
