I would not call you a non-resposible fish keeper, but with that kind of money invested, I might not walk away.
There are many things that can go wrong beyond main breaks, sinks holes, and other natural and un-natural events that are beyond your water companies control, or probably beyond yours.
Where I used to live, I had to constantly monitor water temp, color, and chlorine residual during water changes, my water could go from 70'F to 35'F in seconds, and if I was not vigilant disaster was inevitable. Chlorine could go from 1ppm to 4ppm, if there was a main break, or main flush.
All it took was one deadly event, to learn a very expensive lesson for me.
My purpose in my response is to educate, not harangue.
I used a temp probe whenever doing a water change, and check it every few minutes.

There are many things that can go wrong beyond main breaks, sinks holes, and other natural and un-natural events that are beyond your water companies control, or probably beyond yours.
Where I used to live, I had to constantly monitor water temp, color, and chlorine residual during water changes, my water could go from 70'F to 35'F in seconds, and if I was not vigilant disaster was inevitable. Chlorine could go from 1ppm to 4ppm, if there was a main break, or main flush.
All it took was one deadly event, to learn a very expensive lesson for me.
My purpose in my response is to educate, not harangue.
I used a temp probe whenever doing a water change, and check it every few minutes.
