-bgc
This. Good points.
I've had numerous opportunities to discuss Bitcoin with high net worth individuals, and the overwhelming majority are not even aware of its existence, let alone participating. Though they have universally seen the potential and hope the best for Bitcoin after it being explained, the main view is indeed that the system is too young and unstable to be upset with large capital flows.
A primary use for Bitcoin among the wealthy is not as a standalone form of currency, but as a means to safely transfer wealth without having to incur the risk of physically moving it. For instance: sell physical gold to buy bitcoins; relocate; sell bitcoins to re-buy physical gold. In most situations, this is far less expensive than physically transporting it, and it can be done in stages with a few million of EUR or USD at a time.
The one factor that will change this is awareness - spread the knowledge of Bitcoin.