What if you woke up tomorrow, and you found that your one traffic source was suddenly broken and you are no longer receiving traffic and making sales? Are you going to do nothing about it? Certainly not, I hope. You're going to get up and take action. But at that point, it might be too late and you might have to start from scratch all over again. That's a very real possibility, and unless you have multiple traffic sources, there is a danger of losing all of your business. Business online is ever changing; that's why you need to market at the speed of light.

It's also important for marketers to never stop learning. Almost every marketing tactic available today, every single one of them, will become obsolete or will evolve over time. This is because innovative people are constantly making things better, or changing things, and the market's behavior is ever changing too. Nobody expects to use today's iPhone ten years from now. There will be something new then.

The easiest ways to always maintain a competitive advantage is to always use legitimate methods rather than black hat means. Black hat methods never last long; their life span is short because the forces that be will eventually deal with them. White hat methods last longer because they actually deliver value to the end users.

Another key is to adapt and evolve. Article marketing, today, is not the same as it was five years ago. There is more competition these days, but there are also more ways to market the articles as well as make money from them. Those who don't change with the times get left behind.

Multiple traffic sources - that's the secret to generating a consistent income. Constantly test the waters of new traffic generation methods; you never know when you might hit a winner and add a new strategy to your marketing mix.