With SMP, along with WordPress, you will never have to worry about centralization, because with this plugin SMP let WordPress do what it does best – content management, and SMP takes care of all members billing and management.
With this plugin, not only you can run a traditional membership site, where members pay you every month to access your content/downloads behind a private member area, but also a FTM style site, where you set up your content in a sequential delivery format (day 1, day 2, day 3..and so on).