Thank you. What I liked about the metaphor is that it fairly accurate. But you may be right about the overuse - it's hard for me to work out the right balance when explaining physics, and I perhaps err on over-explaining. Then again, no one really complains if you make something too easy to understand! :)
I would improve it by defining the relationships between money/happiness and energy/entropy before giving the example. I would have found it a lot easier to read.
