I know that it is a policy of this site, not to talk about RC vendors. However, maybe it would be a good idea to at least have a thread where people can post about negative experiences they've had with some vendors. Vendors that mislabel products, don't answer questions, sell realy dangerous chemicals without any proper warning, spread misinformation about their products, or who are simply scamming people.
It's a jungle out there. The fact that this is a legal grey-area attracts many unscrupulous individuals who simply want to make an easy, quick buck.
For the sake of harm-reduction, it could maybe help if nexus members could simply warn other nexians if they have had a bad experience with a particular vendor.
I also see reasons NOT to want this (like even more spam), but they could probably be circumvented with some clever policies.