The purest form of making money is:
PPC and Affiliate Marketing combined.
Why? Because it focuses on the bare essentials:
Buy traffic with ads -> Convert traffic to the affiliate offer -> Profit.
The nice thing about this is that it can be scaled easily when you have a working formula. There are less limitations by buying the traffic you need. Trying to SEO a site means a limited amount of traffic, and much more beholden to the vagaries of the search engines and your competition.
Downside of this business model: It can be easy for other people to copy your ads and landing pages.
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