+1. This is the correct answer.
Once you're in the fortunate position to have millions to worry about, then your priority rapidly shifts from return on capital to preservation of capital.
Your time shifts away from making money, to preserving it for yourself and future generations, i.e. you spend more time talking to lawyers and accountants than to brokers.
Your investment portfolio structures very quickly move away from growth strategy to well diversified balanced one. You (or your broker) will spend more time buying bonds and boring large-caps, with maybe a few mid-caps thrown in if you feel like playing on the wild-side.
Your strategy will rapidly change from "anything goes" to long-only equities and bonds. Messing around with derivatives and FX generally doesn't happen, except maybe as a punt on a small corner of your assets if you fancy a bit of gambling.
Your investment timeframe rapidly shifts to multiples of years, with maybe a few things held for a few months. But you certainly won't be doing any day trading.
Yes its boring. But as I said, its all about preservation of capital. You've worked hard to make all that money, most people once they've reached that stage in life just want to relax and enjoy the benefits, and not be kept awake at night.
By that logic there would be no individual traders reaching 20, 50, 100mm. Yes, you might scale down your day-trading strategies but if there is liquidity without eroding the edge, you wouldn't just switch to low return long term investing.
