Hello,
I'm pretty new to the site also, but I've benefitted quite a bit from the honest feedback. It seems to me a writer won't benefit as much from watered-down reviews.
Editors may be good people, but they're not nice.
Perhaps another approach is for the moderator to give warnings before removing someone from the Premium Group? I agree with Gray, that the quality of reviews may suffer as a result of such measures, especially in light of not having clear policies and procedures to this effect. To me, that represents a breach of contract, as a paying member: to be removed from a group without following the site's own policies.
From a policies and procedures perspective, I reviewed the FAQs and policies of the site. Now I truly may have missed the part about how a member may be removed from the Premium Group. Normally a site like this would have a policy that could be followed regarding member conduct. Where none exists, the question of equitable treatment comes into play.
Besides lacking policy, there's the question of promotion. The site promises to "guarantee...substantive feedback" for new members. It may be argued that those who provide honest feedback and thorough reviews help to fulfill that promise, not detract from it.
Just my 2-cents. Jeff