I wonder if many people are putting off buying a bitcoin to hang onto, due more to trivial inconvenience than calculation of expected value. There's a bit of work involved in buying bitcoins, either getting your funds into mtgox or finding someone willing to accept paypal/other convenient internet money sources.
What if we're putting off buying a bitcoin because we, uh, don't want to?
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.