I just recommended WPMUDEV to client and she said she couldn't find the membership options. I logged out to have a look and realized you only have the "Start Free Trial" button that opens a payment window. Off to the side is copy that says you will start charging $49/month after the trial and smaller copy that says the price includes everything.
I don't think she saw the smaller copy about including everything because she thought it was just for the Membership 2 plugin. She also didn't see an annual option.
One thing I have noticed here is that some of the paths to information are a little less than obvious or intuitive. In this case, I would suggest a "How much does it cost" page that outlines what is costs, what options you have and what you get. THEN click the start your trial button.