Its a financial "investment" that has the potential to earn high returns in resale, operating costs, and recreation!!
No offense Mike, but I don't see that as a strong sell:
Wifey: "You never take me anywhere."
Me: "I agree, dear."
Wifey: "Really?"
Me: "That's right. So, for our recreation I bought a 900 pound diesel engine. It will bring us closer together."
I considered lining the bathroom with cement board and then rolling out the Listeroid as a 'sauna machine'. Seriously. I also considered hydronic heating in our floor and in the garden to extend the growing season.