A good point made by another poster, if you have blown-in insulation,
it results in a serious code violation with K&T....something many
people are not aware of and salespeople tend to say nothing about.
Also, you might want to take a peak in the attic and/or basement to see
if the old cloth covered cable was spliced into the K&T without using
boxes, another serious code violation.

I know that you don't want to hear it, but IMHO, K&T and cloth covered
cable has had it's day and the "phase out" has been extended by NEC
long enough.

around here pittsburgh area all K&T is boxless

it was spliced inside the wall with no boxes, then covered over by
wood lathe and plaster so a overheated connection can cause a fire, and
insulation just makes it worse.

NOTHING lasts forever and what else do YOU own that lasts over a 100
years?

people think nothing of a new car every 5 years, for dependability and
safety. that would be 20 vehicles in a hundred years. at a very
consertive 10 grand a year $200,000..........

meanwhile some get upset over spending a few grand........

I had a friend shopping for a home, it was a $100,000 but the K&T HAD
to go to get a mortage. the seller refused the 5 grand credit and my
friend bought a different home.

the housing market cooled while the home went thru three realtors.

the home finally sold for 85 grand, clearly the seller made a bad
choice.. cost him over a year and 10 grand.

I HOPE the OP gets his price and a quick sale........