Reread what you wrote, mate, and think about it a little, and I think you'll have answered your own question 
It's Monday, so I might need it explained to me. I know you're a stickler for logic though. I
think you're saying that if wealth isn't limited, it's therefore infinite?
Even if family wealth isn't capped, it would still be limited by the amount of gold each player can get his hands on, and then by how much he decides to allocate to his family fortune. He can send all of it to the family if he wants, but most won't because there are more interesting things to do with your gold, like building an army. So I think the warnings about "infinite numbers" overwhelming the database and "infinite gold being sucked out of the game" and an out-of-control 'arms-race' of wealth accumulation are exaggerated.
