Because that would be business suicide. Those sites make millions of dollars a year. They have super successful and growing companies. It's like me on the wolf network. I would never touch my clients niches. No matter how juicy they are. My core business is FAR too important. Why risk the integrity of my business for a few side bucks? Why risk a million dollar business just to get a new niche site making a few k a month. Doesn't make sense. And that aside.. The above method is EXACTLY how I find and rank Amazon review sites. I hunt out weak sites with high traffic/high keywords, then I replicate every page with traffic > 300 per month. I scower niches for these sites. They are sitting ducks. The OP should DEFINITELY sell.