Nice find dude.
One worker 725g/h sure looks like one to me... no more new gpus for me.

it is definitely not one. You can have all your rigs use the same worker name and it will all be aggregated into 1.
The only reason to split them up is to debug which one has problems. If you dont mind or has other ways to monitor then you can simply have them all register using 1 worker name.