What user groups do you have on your forum? I have Administrators, Moderators, Members, and user groups for premium members. Regular users can become premium members by upgrading through the Shop, and, they'll receive account perks for doing so.
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I don't own a forum therefore I cannot answer this question, however, as a member on a couple of forums, I have see lot of forums have different user groups for different tasks. I have never been a part of any specific user group