I've done many things that got new data ingested on a monthly basis. So say 29 days out of every month they would be idle.

Is it worth starting and stopping those kind of things? Probably not?

If you turn off a VM running something like that, because you didn't see any traffic for a day. Are you going to explain how you just shut it down to save a few dollars a month? I would very much like to see how that unfolds