How many minutes per week do you actually play with your trains?
For myself, if I were to tot up the time spent travelling to exhibitions and shops, model-making in the den, reading the various hobby mags and books (and eavesdropping this NG!), I suspect that the time really spent on the end purpose is only about 1% of the time devoted.
What arguments can I then make to SWMBO to counteract the claims that the money and time would be better expended on the house?