Hey are you publishing your own paper or is this some college research anyway I will try my best to answer these questions. 1) The main reason for me was the interesting technology behind it, also it being decentralised currency also had a role. 2) I use it for diversifying my savings, also use it for payments of various stuff. 3) I believe bitcoins adoption shall rise, and so shall it's prices in the long run. 4) I don't fear anyone, I don't let the short term fluctuations effect me I hodl it for the long term.