I would have to agree with the frustration shown by others. I have another suggestion - color code the Ethernet only port yellow some way, as most routers have the same colored port. We purchased yellow ethernet cables to help keep this less confusing for customers. And maybe color the other port another color to differentiate the two for when techs are working with customers.
A suggestion for helping keep issues down - zip tie the power cord and power ethernet cable to the sides of the brick. This would prevent the power cable from accidentally getting unplugged, and prevent the ethernet cable from getting plugged into the other port of the power supply.
Josh