Reading is open to everyone. Speaking takes a free account, so one shop is one voice.
Vendors are welcome here as trade members — but selling stays out of the discussions. A vendor's word carries weight only on subjects that aren't their own wares.
Posts that report an outcome — "ran it, here's what happened" — are the heaviest currency in this house. Documents (code text, an MSDS, a spec sheet) are the other heavy lane. Disagreement is data: splits stay splits, and suspicious accounts get a visible tag, not a quiet deletion.