I know that someone need to get prepare before it can start any investment by asking him or her some certain question, but there are some question that is not that necessary for someone to ask him or her before they can start their bitcoin investment. So, I feel the make question should be: do you have stable sources of income, and did you have knowledge about bitcoin? And they did always have discretionary funds, because there some people that even have stable sources of income, but they don't always have discretionary funds always. But as far someone always have discretionary funds, it can start bitcoin investment. Bitcoin investment is not really hard, as far someone is getting money that, after providing the necessary need, it always have some money available.