Generally speaking, you cannot make much money for any length of time by copying what others do. I know several very successful people who each made their money by being "first movers" who saw an opportunity and took advantage of it before others could jump in. If they stuck with it and held on to the success it was because there were significant barriers to entry that prevented hundreds of others from copying what they were doing. With Internet businesses, it is hard carve out a niche and keep it successful for several years.
The perfect example is the original eBay Power Sellers. Each of the original top sellers literally made a $million+ their first year and then went bankrupt in the second or third year.