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I'm not completely sure what your question is, but I'll try to address it. Members are anyone who signs up. Members can add to PlantFiles, participate in some forums, and add to the other member-driven parts of the site like GardenWatchdog, BookWorm, and so on. (I didn't put links in this time.) Subscribers are people who pay to have unlimited access to PlantFiles, and to many many more forums. I'm not precisely sure how the decision is made as to which forums are open to all members and which only to subscribers. I've quoted below from the Frequently Asked Questions about "communities".
Quoted:
Are any forums accessible to non-subscribed members?
Yes. All registered users may fully participate (read and post) in dozens of forums (those that do not have a red asterisk next to them are accessible to all registered members.)
We welcome participation from all our members within these forums, but all posts must remain on-topic. Off-topic posts should be reported, and are subject to removal. Repeated attempts by non-subscribed members to post off-topic comments may result revocation of their membership.
Additionally, non-subscribed members can read (but not post) to the Dave's Garden FAQ forum, where many other site-related questions are answered.
Non-subscribed members can read only the first post of the threads in forums that are noted as subscribers-only. A few other forums are visible only to subscribers.