Ask What is the importance of building a membership site?

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I keep hearing about membership sites, but I don't fully understand their value. Some people say they bring steady income, while others mention building a loyal community. I wonder if they work better than regular websites or blogs. Are they hard to maintain? Do they offer long-term benefits? I don't want to start one without knowing if it's worth the effort. I'd love to hear from people who have experience with them.

What makes building a membership site so important?