Exactly its difficult to earn that amount on weekly and regular basis, but its possible with trading but to earn that profits you also need to invest higher capital in it.
Well 0.3 bitcoin a week is really hard to think on what are the sources you have for you to be able to earn that amount weekly. But only what can I think of that people who are earning that amount are the owners of exchange sites, trading sites and as well as the gambling sites. For sure they are earning that much and even higher.
People with higher investments are earning more then that on regular basis, but investing huge capital is not possible for all of us as we always have an fear of loosing it.
yes basically require a large capital for investment, and I think this is a special person who has lots of money to invest.
and a simple man or do not have much money, it is better to trade altcoin, it's really worked well for them rather than investment.