You can easily earn that amount if you have multiple ways of earning bitcoins as you cannot expect that income only from single source of income so try to multiply your ways of earning from sig campaign, trading, gambling etc.
You can expect some income from trading and signature campaign but not sure about gambling as it is the most risky way to earn bitcoins and there is no guarantee that it will bring only positive results for you.
I agree with you. You do not have to wait for a large income from gambling. High income can be obtained from active actions - trade, MLM. Business on the Internet can bring more income than work in the office