I don't begrudge the expense at all - it's an excellent investment in the house. That will leave me with steel liners in the two most potentially dangerous flues - the woodstove (chimney fires) and the boiler (carbon monoxide.) These are extremely good things. It's just that for the same amount of money I could have two full days of tree work (sun on the roof!); or a new well pump (rocking water pressure!); or new doors for the entire first floor. I can't *see* my shiny new boiler flue.
What I CAN see though, is my incredibly cleaned up basement. I'm loving that.