-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.
Bitcoinis very popular today so that its price is very expensive, Just like a gold, bitcoin is being mined and it is limited, there are only 21 million of bitcoin, I think less than a 50 percent of it is being mined and being discovered. So that bitcoin is very valuable.