Cost/Benefit for Castle types

[TheSelfishGene]

...then everyone would still pick the Watchtower, but simply have 80 more points to spend on magic or scales.

The problem with the Watchtower issue is that armies just aren't valuable enough for long enough, and temples are too vulnerable because PD is too weak. So doing this without any other changes would just tilt the game further toward those with strong early expanding SCs.