I purchased a niche package recently with the goal of boosting a particular site for two primary key phrases. Those two key phrases both boosted 7 spots and 10 spots. I achieved my goal and it paid off.
That doesn't mean it will pay off for you. There are many variables involved. You need to know what you are buying, why you're buying it, and what to anticipate. There are also things you need to do on your (the buyers) side to ensure that you are setting things up right for your purchase to make an impact.
SEO is multifaceted. You cannot depend on any one variable. It's a combination of many variables.
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