Why does the SANSA turn it self "ON" after charge ??

Why can’t the SANSA remember its last state as being off.  It is very inconvenient to have to remember to ensure that it’s off after charging.  It seems like it would be a simple fix.  The SANSA knows to turn on when the USB charger is plugged in.  Wouldn’t it make sense to turn off (if that’s the last state) when the USB is unplugged?