just to clarify my idea:
keeping a MD on all the time is something that has to do with the importance you give to the services that are hooked to it and the price you agree to pay for it.
By an "energy balance" point of view LMCE is pretty power consuming. You are supposed to have a full blown server running 24x7 and a small energy fingerprint pc for each MD that you want in your environment.
This makes a discrete amount of bucks in energy cost at the end of the year.
In my country electric power is not that cheap and government is promoting a lot of incentives for "low energy home", and as far as I'm concerned I wouldn't mind if I can reduce all power consumption that in my opinion is not strictly required.
In another post there was a discussion about lowering CPU freq of Core/hybrid, in order to decrease power consumption in off-peak hours. I think that also the hybernation topic was already mentioned before. This means that energy saving is somehow an issues that more than one user start to consider, especially now that we have a reasonably stable environment and users are more keen to think about "fine tuning".
In my environment (that may probably differs from yours) the only reason that would suggest me to keep MD on is the "follow me feature". All the rest (lighting control, basically) is hooked to Core. I use MD only as media player and nothing more.
So in principle I need MD switched on only during the time frame when I'm at home.
Actually something that I would like (and as soon as I solve other bigger issue I surely try to get) is something that turns on MD at a given time, and that turns MD off when leaving home.
As I told in the beginning, this is my point of view.
Maybe this is a limited perspective, so if you have different idea share it with us.