If you are a forex trading player. You should try bitcoin/altcoin market as well as bittrex, poloniex, etc. The system is not much different. You will not trouble to get 0.5BTC/week, because you are already familiar with fundamental analysis techniques. But at least you have to be prepared with minimum capital 1-3BTC.
Another way is:
Entrepeneur = good at making ideas/network group = understand the concept = action. I'm not talking about ponzi, but many marketing business that started from the network, with capital that is not as big as trading.
Yes try bitcoin/altcoin market it could collect 0.5 BTC with a few weeks, but indeed with a large capital as well. But I think professional traders can do it, provided it has a good technique. Marketing business that starts from the network that I think is good and it does not away with bitcoin, but it takes hard work that great. I personally can only produce about 0.3 BTC per month from signature campaign, trade, and some freelance work (which pays with bitcoin). Skill and tenacity is a major determinant. As long as you never give up if it falls, and keep learning, there remains a chance of success, you just have to be brave to do it.