The highest level of walls available was now Level 7, and they'd definitely use that everywhere, so the expenses made people feel like drowning just by thinking about it.
At best, she'd probably slightly reduce the cost by not walling all the way to the edge. When they didn't wall after the town upgrade, they really felt the advantages of a sizable forest area outside the wall, but within the territory, especially for those who wished to train well and on the ground.
It would also allow her to build sentries beyond the walls. Many fighters who used the current outlier sentries called them 'savior towers' which was indicative of how useful they were for the citizens.
Further, now that the high-level sentry's scope was larger and could shoot a bit more frequently, its usefulness in this scenario was amplified.
