Duplicate content between member areas?

Is there really no way to share content between member areas/tiers or grant access to the lower tiers to higher tier members? I was going to use Member Areas with the lowest tier being behind-the-scenes access, downloadable content, and two higher tiers for a domestic and international mail club. It's really difficult for me to believe that Squarespace thinks I'm going to pay DOUBLE just for the ability to add the mail clubs onto the Member Area AND duplicate all the content I create across three separate areas, with no ability for members to interact with each other. I'm just genuinely baffled by this and have to think that I'm misunderstanding here.