Victim
First Post
To make a dangerous analogy to the real world, not every country has ICBMs, carrier battle groups, state of the art fighters, etc. They can't usually afford to buy them, can't usually make them, will likely have problems maintaining them, etc.
Another issue is that if you do have a bunch of high level guards, what keeps them from taking over? Maybe it is better not to have all those powerful guards around in between crises, raking in pay for handling low level tasks and maybe getting ideas...
Of course, a city may have other means of defense besides high level guys. A foresighted ruler or ally in the past may have bound some guardian outsiders to help defend the city against major threats, left a stockpile of high level scrolls that low level casters might be able to use to help even the odds, etc. Of course, once you lose that kind of defense, you have to start over.
Another issue is that if you do have a bunch of high level guards, what keeps them from taking over? Maybe it is better not to have all those powerful guards around in between crises, raking in pay for handling low level tasks and maybe getting ideas...
Of course, a city may have other means of defense besides high level guys. A foresighted ruler or ally in the past may have bound some guardian outsiders to help defend the city against major threats, left a stockpile of high level scrolls that low level casters might be able to use to help even the odds, etc. Of course, once you lose that kind of defense, you have to start over.