First, cryptocurrency can make us know people from different countries and cultures.
Second, the cryptocurrency and blockchain may change our lives, and I believe in the future.
Third, cryptocurrencies are in a bull market and can make money, which is the main point.

You listed good reasons, but the second is better than all, because this is also my main reason. I believe that digital currencies could come to replace fiat money throughout the world, and that the advancements in blockchain technology could spread outside of the cryptocurrency world and inspire innovation across a much broader spectrum of businesses.