I use bitcoin because it offers a great opportunity for different people out there just like me to earn money without going to work or for other people like students who just want some sideline that can help them financially. I think most of us use bitcoin because of its value and freedom for us people to earn it without requiring specific age. Also, I use bitcoin because its secure because when i do transactions with bitcoin i didn't risk my identity and I feel safe because of that

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Bitcoin offers us an great opportunity to earn extra income but if your income is limited then its really very hard to depend only on it for living unless you have great capital to invest in trading from where you can make money on regular basis but apart from that I am using it for online shopping and online money transfers.
I think trading is not giving you stable income and the income in bitcoin is not limited if you have a lot of time to do work in bitcoin much better income you gain than only doing signature campaign which is more users do it for their free time. I used bitcoin as my other income which i can not give more time to this because i have regular job.