[Tuidjy]

> No--the castle increases the available resources in the province you put it in at
> the expense of the provinces around. Neither the total income nor the total
> resources are affected.
>
> The only way to affect the total is what scales you chose when you started the
> game.

This is absolutely not true.

Building a castle will increase the income of the targeted province, without
affecting the income of the surrounding provinces.

As for resources, not only does the castle increase the resources from the
targeted province, it also brings in resources that were previously not
present in the surrounding provinces. Now, when you have more than one
castle drawing from one province, things get trickier, and you can (will)
reduce the resources in the uncastled provinces.