I think those CPU-s make enough Raptoreum coins for you to save them and build up your stash,of course if you have the economic power to keep running them although right now they are unprofitable.Personally I am mining at work (am allowed to do so with permission) with my 2 PC-s,one is an old Xeon processor and the other a core i5 8500,both of them make me like 12-15 coins daily and I am already near 1000 with just two months of free mining.
If you need to put money from your pocket to keep the rigs running to pay for electricity and you cannot afford to,then shut them down.If you can afford to keep the rigs mining by all means do so,in the long run I predict beautiful things will happen to such persons.