I have a clickbank review site that is earning anywhere from 60-250$ per month. It is more or less just a review site and is getting all or most its 200 monthly visitors from the "product name" or "product name review" query. I owe the 60-250$ per month simply to the quality of the review I wrote. However, I am wondering if there is a point to writing and adding more content to this site? If that would increase sales? It is a fitness and health product so I doubt I will be able to find any long tail low comp keywords at all. I will essentially be writing articles in hopes some LSI term is being picked up somewhere in googlespace by any incoming lifeforces out there. I am wondering if there is a point to doing this or if I should just leave well enough alone and work on something else?