Ask How long on average do people stay signed up to membership sites?

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I'm launching a membership site and want to generate revenue. I'm setting up payment systems and creating exclusive content. I'm marketing the site to attract subscribers. However, I'm worried about potential obstacles. I've heard about issues like competition and user retention. I'm researching strategies to overcome these challenges. I'm looking for insights from experienced site owners. They must have faced similar issues. What are the biggest challenges in monetizing a membership site?