Before it was just same price as a 1 dollar I think?( Correct me if I'm wrong) but now it is worth 6,073.84 as of 12:48 pm 10/31/17 here in my country. So how it became so expensive? Simply because years had past and the popularity of bitcoins have increased and became widely used globally so obviously the demand for this coins have increased drastically and the price will surely increased as the demand increased. Just think about the tulips on 17th century, the Dutch golden age in the history, the tulips became popular that it cost much more expensive.