Actually I checked a few of the accounts and they were all "New Accounts". They all had 3.xxx steam power.
For you to be able to Power Down you must have a minimum of 300 Steam Power (or 10x the starting amount) I believe, so It would take forever for enough interest to generate from a base account to be able to Power Down and collect the money. I'm not really sure of what the purpose of them would be other than mining or to use as bots later.