It's not just about you living comfortably. That extra 30 million will help your family for generations. I'm sorry but most people work there whole lives and don't make anything close to 30 million.
If I'm making $80m, the addition of another $30m (taking it to $110m) isn't exactly going to change long-term fortunes like gangbusters. Either I'm investing well enough to be making a considerable return in perpetuity, or I'm not. Given that I'm not one who is apt to spend foolishly or live extravagantly just because I can afford to, I'm pretty sure it's a non-issue.
Edit: To elaborate, if we assume I spent $30m of my $80m on hookers and blow over the ten years in question, and I could find a way to invest the $50m with a return of 6%, and I assume there's a 3% inflation rate, I would still safely be able to withdraw the equivalent value of $1.4m/y (in the year I invest it)
in perpetuity. With an extra $30m in the bank, I could jump that up to the equivalent of $2.3m/y. Yeah, that's a big jump, but I'll be honest -- if members of my family couldn't live off of their share of the present day equivalent of $1.4m as a supplement to their income, I wouldn't want them to have the money to begin with.