You're touching on what I think might be the fundamental problem with territories is. They have to be expensive enough to support the cost of maintaining and developing Stacker News.

100ksats per month might be too high for many territories to turn a profit, as well as being too low to support the site.

Ultimately, there will need to be some sort of pricing mechanism for territories, but the goal will be (and should be) profit maximization for SN.