Because it brings a lot of people to make huge profits through investment and realize the possibility of getting rich. Human nature is greedy, eager for wealth, crazy in the encrypted world is a normal thing.
Simply, everyone is looking for profits and areas they can easily invest into to make shit load of it and I guess cryptocurrency paved that path for them. This is a very new world and we all know how the idea of early adoption usually works and for those who actually know how to tap from that, and benefit from the future, they can simply make a huge profit from it, which I believe no one will ever want to be missing out for anything.