There are a lot of unwarranted claims posted about the Bitcoin economy here every day. In response I will post one thing which I think is misrepresented by BTC investors.
You can then as this thread goes on try to pick the argument apart.

For today:
The Bitcoin market cap is usually quoted as every BTC currently in existence times the current market price. This is not true because the majority of BTC were never traded for currency. Even worse during a rally the supply dries up because people do not want to risk having the price surpass their ask significantly.