It's quite the opposite actually.
These requirements are set in the EPIRB standards it's not something the GME have come up with. They aren't cutting corners, they know that there is a plethora of choice out there, they have nothing to gain by pissing you off, because they are following a standard, they know you could well go to another vendor. Would you prefer that they put new batteries in it took your money and sent you on your way with a "your epirb now doesn't meet the NZ safety standard, but she'll be right mate..."
They probably just lost your business and lost revenue becau