I am not saying it will magically enforce them, but this place is large and complicated. I think some of us older users forget this since some of it just becomes second nature. Also I don't exclusively mean for organizational sake. For example the auctions section could do with some standards being more universal to make auctions run more smoothly. Local boards might have various local laws which they might want to keep enforced for liability reasons, etc. There are often new users who would gladly abide by the local customs if they even knew what they were. Even if it is something people could use to reference I think would be handy.

The point is to have a reference that applies to the subforum specific unofficial rules/customs only, conveniently located in a spot that those using that forum most will most easily come across. Some of these subforums are larger than entire other forums. It makes sense that there would be some differences in standards and type of community between them.

Yeah the marketplace section was the primary area I think that this would be useful. The template is not a bad idea, perhaps even a standard contract phrasing people can use with all the standard protections for the seller such as bid extensions, etc. These are the kinds of things users would usually be more than happy to generate, post, and whoever is managing the OP could curate. Again, of course many will ignore these, there is also an inherent incentive to use these in the marketplace section as those selling things usually understand they want to cater to their potential customer base. I am interested to hear however if any of the local forum moderators would find this useful.

https://bt.irlbtc.com/view/4511686.msg40630435#msg40630435

Suggested and already implemented by several authors. 

IMO, this is more efficient that having the guides in a different area of the forum.

I agree that each subforum should have a sticky with local rules, policy, guidelines, etc. What I'm not sure about is how to address the issue that such stickies usually get ignored. In Meta we have the stickied rules thread, but we ban dozens of plagiarizers every day. In Lending we have a sticky about collateral, and yet we see newbies asking for no collateral loans daily. In Digital Goods we have a sticky about not buying from auto-buy links or locked threads, and yet we regularly see scam accusations threads about people being scammed from these exact things. And so on and so forth. There was the idea of a "Welcome Message" for all newbies a while ago, which would be helpful to draw their attention to the general rules sticky in Meta, but you can't do that for every thread in every subforum.

There is also the issue that some stickies are ignored by all users and moderators alike, such as the sticky in Services about signature campaigns, which suggests that both users and campaigns will be banned for spamming and low quality posts, which just doesn't happen. We can't expect newbies to know which stickies are essentially rules and which are completely ignorable.

In this instance I would suggest some kind of incentive system. Perhaps we can start meriting new users who do it right for example... Either way I didn't claim to be able to solve this problem, the point is for some of these subforums there are lots of seemingly small unofficial rules that stack up to cause issues if ignored.

At least a sticky would be useful for the users who cared to look. I never claimed this was going to shake the whole dynamic of the forum or anything. it might also serve as a useful place for those that do frequent the subforum to hash out their own personal protocols as they use it the most.

https://bt.irlbtc.com/view/4928968.0

In action for six months.  No need to change anything    

Any moderators on the local boards have any opinions on this?

Why not both? The "unofficial rules" thread for the subforum could help to generate those warnings. Maybe after one ranks up they can have a feature to turn it off or something. I prefer the sticky suggestion simply for the fact it requires no modification of the forum software/structure itself and would be most easily implemented.