Day off callout pay should average at least double your daily pay rate, ideally an hourly rate based on duty time. You allow that to stay as is and your company will never employ enough pilots and just keep using the cheap labor that will work a day off for less than their normal work day pay. Most turboprop FOs earn more than that on a callout. Remember that working days off or on leave doesn't add to your super or leave etc, etc, unless its specifically in the EBA, so you lose more than just a day off for a days pay.