Yep, but I'm heavily into "what if", as in "what if it was still there?"
There's still the cost of the real estate. Not that I'm shopping....
I have seen some of the BIG homes in England that would be like trying to heat Bavaria to keep them comfortable!
Most of the ones I’ve been in have massive fireplaces in almost every room. A lot of trees have gone into those fireplaces in an endeavour to keep the occupants warm.
And fireplaces are powerful suctions that put more heat out the chimneys than is used inside. The taller the structure, the higher the chimney, and the stronger the draft. I'll wager that the stately homes actually whistled as air was drawn in through every crack around windows and doors.
I capped our chimney off because of that.