-I think It is popular. many people accept and trade in Bitcoin because It is recognized and accepted as a currency by many.
-Bitcoin is decentralized and limited. This is a major factor for many Bitcoin users. Bitcoin is hard for governments to trace and tax
-Bitcoin acts like an equity investment. The market value of Bitcoins has had wild swings in value and even a market cap.
-Bitcoin is a social network. The Bitcoin "community" is active and acts like other online social networks.
-There are only 21 million bits so it has the same value as gold.
You brought some good points, except for the last one. If you refer to the fact that both have limited supply, that's a strong aspect of it. However, that doesn't make both have the same value.
The value that people see in things depends not only on scarcity, but also on usability.