Active income is needed because you know you can always push away to bring in steady income. Passive income is needed to bring in a little extra on the side. You must ensure to never put all your eggs in one basket. When generating multiple streams of income, you must have different sources to rely on – because in the end, nothing is 100% reliable.

While it is important to find something that you love to do and turn it into a money making business, you do have to be cognizant of the return as you pointed out. There are many opportunities that I found and tried out that at the time seemed great. But when I took a step back, I realized that I was working a lot for very little income whereas other things I love doing brought in much more money.
Stock dividends: Some stocks, especially stocks from big corporate standouts, pay dividends to shareholders based on the number of shares they own, and the percentage of the stock price on the dividend date. For example, if a company pays out 3% on a stock that's trading at $100 per share, you'll earn $3 for every share of that stock you own. Add it up and that can be good take-home pay as a passive investment.
Amazing that you saved between 50% to 75% living in NYC…I think that is one thing holding me back…the cost of living here. I’d like to invest in real estate, but I can barely afford to buy a place to live. I don’t need a large income to be happy, but I probably do need an income to support living in NYC as we don’t plan on leaving. The only thing I’m doing at the moment is saving in my 401K, IRA and a I dabble in stocks and P2P lending.
I like to think about having an additional source of income as being sort of like an insurance policy. I interviewed one young woman who taught aerobics classes in the evenings after spending her days working as a videographer for news organizations. When she was unexpectedly laid off from her day job, she quickly doubled her aerobics teaching load and was able to keep herself afloat until she found a new full-time job. Some more examples of income multi-streaming are a teacher I know who sells used baby clothes out of her home and a young couple who run a small Internet business on the weekends. Just like these people, you can also pick a profitable project or create a business that matches your lifestyle. 

Lending Club is a platform where you can lend your money to other people. You’re the bank. Each note is only $25, so you can invest $1,000 and lend money to 40 people. There are many grades of loan (from safest to riskiest) and investors earn, on average, between 5% and 7% annualized returns. For more information, check out Investing and Making Money with Lending Club Peer-to-Peer Lending and my real money Lending Club Portfolio.

Most credit card companies offer sign-up bonuses to entice you to open a credit account with them. As long as you don’t spend money just to hit the minimum balance and always pay your balance on time, this can have a minimal impact on your credit score while earning you hundreds – or even thousands – of dollars a year. Some of the best travel credit cards offer 100,000 points to new accounts when you meet reasonable spending requirements.

Andrew Rafal, Founder and President of Bayntree Wealth Advisors in Arizona, recently told me about his push to get clients to diversify their income streams. The Great Recession feels like an eternity ago now that the economy is looking up, he says. The job market is strong and consumer confidence is through the roof. As a result, it’s possible people are getting a little too comfortable.