Final paragraphs below; for a different approach, see After 7,500% Rally, Cryptocurrency Founder Sells All His Coins (Bloomberg)
"They said they might look at selling when the value of all the Bitcoin in circulation approaches the value of all gold in the world — some $7 trillion or $8 trillion compared with the $310 billion value of all Bitcoin on Tuesday — given that they think Bitcoin is set to replace gold as a rare commodity. But then Tyler Winklevoss questioned even that, pointing out the ways that he believes Bitcoin is better than gold.How the Winklevoss Twins Found Vindication in a Bitcoin Fortune - The New York Times
“In a funny way, I’m not sure we’d even sell there,” he said. “Bitcoin is more than gold — it’s a programmable store of money. It may continue to innovate.”"