Ask Why Build a WordPress Membership Site?

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I hear a lot about WordPress membership sites. Many people seem to prefer them, but I don't know why. Is WordPress easier to use than other platforms? Does it help make more money? I want to understand if it's worth the effort. Running a site sounds like a lot of work. I don't want to start something that won't last. If WordPress is the best choice, I'd like to know what makes it stand out.

What is the main draw for building WordPress membership sites?