This is great advice for everyone. There are way too many options for marketers and it can get overwhelming at times. By specializing on few niches, you do have a better chance of mastering your verticals as well as understanding the demographics that can maximize your income.

Its not about purely running acai rebills though, if you still can.

Its about selecting a solid long term niche, such as say auto insurance, then running every type of traffic to it, ppc, social, ppv, seo.

Once you get to a certain level companies will start approaching you. This is the a million times better than having four of five short term offers running, on a select couple of traffic sources.

This type of strategy is where the industry heads as it slowly matures.

Its called long term.

Think of it this way : If the vertical gets fucked overnight, you are supposed to have enough money left to start in another. Why does so many people assume that successful affiliates don't save *any* money for catastrophic events ?

At the end of the day, it is sales. I'm sure Ngo has developed exceptional sales skills by drilling down in one niche. He could most likely replicate his success in other niches. Once you've mastered the sales skills, it becomes less about what you're selling as long as the market is there.

When you become an expert at anything, patterns, trends, and opportunities pop out at you. This puts you in a unique position to cash in.