If I post a thread now in the marketplace, when I don't have the premium membership, but later decide to join the premium, will my older thread be highlighted? Likewise if my premium membership expires one day, but then I renew it, will the highlighted thread status follow up? Or will I need to post a new thread?
Threads are highlighted based on your premium membership status as of the time they were posted (adding/removing premium membership in the future does not affect existing ones).