No, once you join MRR you will receive free access to all sites listed. Your MRR login details will gain you access to any of our memberships at any given time.
Currently our list of sister memberships are as follows:
Along with our own sister memberships, we have also purchased the exclusive rights to further memberships that are not operated by ourselves, and MRR members can register and access at no extra charge.
You can view the entire listing of memberships and perks by Clicking Here