One of the main reasons why Bitcoin has more worth than any other cryptocurrencies is because it has the proven track record to secure hundreds of billions of dollars ($269 billion as of Dec.8 ) without getting it lost to theft or accident.
If a person manages to successfully hack Bitcoin, he or she will easily top the Forbes Billionaires List at #1. And believe me, people have definitely tried to get this money that Bitcoin holds right now.
No other cryptocurrency has been held to the same amount of scrutiny and stress-test as Bitcoin. Lets really test the limit of this technology.
Good or bad, Im extremely excited what we will see in the future.
I hope you are too.
It is obviously because it is the pioneering and has the most trusted system where people and investors are comfortable of using from it's existence until now. Bitcoin is for me has the biggest and largest community, adoption and popularity all over the world nowadays. It could also be that Bitcoin being the king in terms of marketcap and that is where Altcoins are pretty dependent on.