If you're looking to hide $10MM+ with one firm, then diversification says that you have a lot more than that in total. So imo the "super-rich" cutoff is around $100M
I'm not sure that you need to diversify for that. It makes sense to have one really good lawyer who knows how to distribute it. The money will end up in different countries, trusts and with a number of partners. But if you don't want to deal with the complexity yourself, you likely need to have one expert who does. That's also why you need so much to start, it's not just about setting up one company, it's about creating a whole net of companies .