I'm not sure your point here. The hub is $130. For around $200, you can buy a used mac mini and just use that for indigo and it will do the same as the hub plus more. The mini only uses 11 watts if you run it without a monitor. My iMac is my main computer and I log onto my mac mini from iMac and make any necessary changes to Indigo that way. Since Indigo uses very little processor power, you can still use the mini for other functions too at the same time.
Oh... not knocking Indigo... love it. Just saying that when on vacation or travel for a long period of time, Hub could keep things under control while the server is shut down and the A/C is off. Right now, I have to keep most of the house conditioned to keep the server happy. That's a lot of money just to keep the basics automations running.