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You decide how much of your discretionary income you want to invest into bitcoin and you decide what is aggressive to you based on your circumstances. I am giving my ideas about what is aggressive, and people do not need to agree with me in regards to what they consider to be aggressive for themselves.
What you are saying is right. What maybe consider as being aggressive may not be so for other people, because everyone has different financial muscle and also different risk tolerance. What Mr A may consider as being aggressive may be normal for Mr B. So it important that we know our limits in other not to over stretched ourselves and to always go with what work out best for us. I still love your idea despite that it may not be similar to everyone.