In 2010 I started my first blog, I Heart Photoshop, to teach Photoshop tutorials and how-to’s to the basic hobby user. A year later, I had jumped ship on that blog and put on my mommy blogger hat. In those early days of blogging, I was like a kid in a candy store when I would receive even $5 from an affiliate link or relationship and I would have NEVER believed that I would ever get to the point where I could generate over $1,000+/month from affiliates.
The online lead generation is a multi-billion dollar industry. Done right it can be far more profitable than many imagine. Everyone that I know that is in the business and knows what they are doing, for the most part, does 6-7 figures. While that's a huge range, much comes to one's ability to scale and effectively build / manage the infrastructure needed to scale.