I guess the income term depends on what it means to you. I've been a contractor or business owner pretty much my whole life, so if I pick a quarter up off the pavement, it is income to me. But I understand what the others are saying, "if you need a regular check coming in to survive, this is probably not a good way to do it". @zxcv64 is right, scared money has a way of departing your account very quickly. But regarding the 250-500k portfolio, I would want to have all that in one type of trade (or a couple). A single system approach is a point of failure. Diversify into other styles/types of trading. Buy some real estate, my buddies that are slum lords let the "property manager" do it all and never get off their beer soaked posteriors. I still buy and sell industrial machinery. If you've got over 40% of your net worth in the markets, you're going to get hurt. 20-25% is probably max.
But just to emphasize, that scared money thing is the real horror, you'll get so wound up it will not only break your account, it'll break you.