Soldato
Sounds like you need to run the numbers on the Mrs ie what it costs to keep her or get a new one/second hand....How well off are they? I have a constant running battle with the missus to try and get her not to **** energy up the wall when it can be avoided. Things like hanging the washing out. Only doing the washing when the weather looks decent so it can be air dried, turning lights out, not running the bath to the point where she will drown and constantly topping up the hot water, using our small and more efficient car instead of the bigger one where possible.
We can afford all these things but come this winter, I reckon we would easily be £500-1000 worse off if she did what she wanted. I don't see the point in wasting money even if you wont struggle without it.