Enabling crossposting for sure has excellent benefits. But I'm unsure what sub-territories add that a territory in itself doesn't already provide. Perhaps however something like tagging could help crossposting more efficiently?

Eg selling a guitar in ~Agora If you go on to tag ~marketplace ~music ~vintage those tags instead of only providing a link to those territories actually autopost that one post to all those territories, similar to how hashtags work in other social media platforms? I'm unsure how you'd consolidate it to one post for all responses however to keep all the responses in one place as currently in that example you'd have 4 separate posts of the same thing. As for posting fees, I guess they could stack so at the bottom where the button tells you how much the post costs, it could count all the territory posting fees and give you one price for multi posting.

Could also be a drop down menu when you're creating a post called crosspost (like options or similar) and have tickboxes of territories you can select to cross post to.

There's definitely a few avenues to explore on how to facilitate crossposts. I do agree that posts should have visibility across multiple relevant territories so long as the poster is willing to pay the price, and we should definitely look at how to automate that process rather than the poster manually making individual posts.

The issue id foresee with tagging creating posts is you'd only want it do so on posts not on comments.

But my point wasn't about crossposting (and hopefully I've given some useful ideas on how to do that), it was about being cautious with charging rent to sub-territories as I'm unsure what value the sub-territories add above that of any regular territory, and how you'd define (which you pointed out we need to be careful about) what should be a territory and what should be a sub-territory. I think it's also very territory dependent aswell, in a territory as busy as ~Agora sub-territories could be a brilliant filter, same with sports and having sub-territories for NFL,NBA,MLB etc but in territories quieter like ~music I'd find it a hard sell to see the benefit of a sub-territory that couldn't just be a thread.

Certainly lots to think about and territories have really changed the game in SN, how they evolve and what grows from them is going to be really interesting to see.

Sorry for the wall of text :/ you made multiple good points I felt deserved proper thought through responses.

EDIT I've just seen your additional bit on the end of your comment. I also think checkboxes would be the better approach than long drop downs. As for letting the user decide, I can't argue against that 😅 but I would say as an example, if someone came to me saying "hey I want to make a sub-territory in your territory" I think I'd advise them to make a specific thread first and see how that plays out and what sort of community engagement it gets before deciding if it warrants a sub-territory of its own. I think that would be a reasonable way forward (would keep my conscience clear, rather than just collecting rent for sub-territories that didn't get off the ground).