Never been one to see rules as a solution but have noticed one glorious error made where a protesting poster confused a MSR Hubba Hubba HP with the standard model. Did make him look like a prat to those that know their tents but maybe a potential purchaser could have been put off but turns out the buyers were smarter and knew their tents.
As for robustness I chuckle on what people expect. A fellow walker loves pushing the envelop on light weight stuff and it has largely sailed through where another walker can destroy just about anything.
I think most buyers are smart enough to see through the opinion so no great need for the rule. I have picked a few things up from the forum and struck no problems. Never sold anything on the forum as I hate the sale process and can not bring myself to drop into sales mode. It is actually funny reading some peoples attempts as their sales pitch is rather different how they normally write.
Still do not like to read pack attacks on posters bit too much like cyber bullying. Sure individuals will cross swords but pack attacks? Live and let live would be a better approach.
Cheers