You can use the standard unix 'dd' tool to copy images to sdcards and usb-drives. You can literally `dd if=whatever.iso of=/dev/rdisk3` (or whatever your disk id is). I have done it dozens of times. It doesn't give you a progress indicator, but I don't need to do this often anyway.
The pro version does make sense thought, I just can't imagine a long running manufacturing process where the SDcards are arriving faster than I can write to them.