I visited the Superformance Owners' Forum website, and my best guess is that they're trying to increase their membership revenues which range from $60 to $95 per year.
Superformance Owners Association
You can't access any of their technical information without joining and paying the annual fee. The information doesn't seem to be specific to GT40s, so I'm guessing much (or most) of the information is for Cobras and not GT40s. But as long as their owners are using this Forum to share and information, it's keeping their membership revenue down on their site while they're paying some money to keep this Forum active.
Understand that the "Superformance Owners Forum" (SCOF) is privately owned and while associated with Superformance does not have financial ties with Superformance, two different owners.
SPF has paid GT40s for the forum so that is not the issue.
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