I don't see that anyone is explicitly set against it, more that people are questioning the purpose and independence of what seems to be an arbitrarily chosen group of people who represent Plusnet users but don't appear to have been chosen by Plusnet users (maybe I've got that totally wrong?).
I'm not suggesting it's a bad idea, but it does seem an odd arrangement for a "Users Group". Then again to me personally as an "outsider" it seems odd that an ISP needs its own Users Group.
cheers,
Paul
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paul <at> spamcop.net