Satoshi's Dilemma Satoshi has created a new currency, a cryptocurrency. The currency has become more popular and valuable than Satoshi could have imagined. Satoshi now holds almost $1 Billion of his new currency. Due to the currencies psuedo-anonimity, low liquidity and it's value in illicit trade it is far too dangerous for Satoshi to cash in and reveal himself...
The key is, though, and maybe this is what you're referring to, that these folks don't store wealth on their home PCs. So their threat model is a little different.
I'm sure HN readers who follow Bitcoin more closely than I do could think of a better system, but presumably the real Satoshi could hire lawyers to set up a company or trust to hold his bitcoins, sell them over time, and store the proceeds in a more traditional manner. Not especially difficult. And, assuming taxes are paid, it may even be possible to remain anonymous.