I have a small review site in the fitness niche that was earning me some cash. Its an EMD of the said product and was made to sell only 1 product. Although I wanna "beef" it up with more content to make more cash, traffic, trust, etc. I am somewhat of an expert in the topic at hand and could easily make a legit stand alone authorative site one day. Probelm is the fitness niche is fucking huge and I dont wanna waste my time writing good shit to be buried in SERPs, hence why I never tried. Question is, if I add my good authorative articles to this puny EMD site, and wake up one day with 50 articles that are earning more from landing pages, adsense and reccommendations than the initial product review......can I later buy a new domain 301 redirect, change the homepage, scrap the product review and flip it around into an authorative site? Like I said I could start a new site with great content from scratch, but I am unsure if it would rank and dont really want to take a risk and waste efforts. This site is already here and ranking for "x product review". Is this a good strategy? Or would the product review and EMD forever tarnish this site?