I really do understand that this is the rationale but I just don't think it's a good idea. If someone is not a paid customer they already do not have access to the majority of this forum, including not being able to post to the sections that would ordinarily be used for support issues. Making a more public display of who paid and who didn't will create far more grief for legitimate posters (whether paid or not) than it would do to discourage piracy.
It is inevitable that someone who is registered on the forum just to check out the community and get a feel for XF will be told that they are not entitled to their opinion (if it is critical) because they haven't actually paid for XF.
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What more is needed to keep priates from receiving support? Yes the formatting is jacked up, I cba to copy it to notepad first just because the editor (still!) sucks.