their costs aren't tied to their userbase
I'd say that they are. Graphene has to serve up the installs for all the different devices they support. That's a lot of data to shift. On top of that there is pumping out updates every second day. Then there is user support. All of these will scale.
my entire point is that it just isn't comparable
I don't know why this point is so important to you. Of course the two organisations aren't 100% comparible but there are strong similarities. Both are tech, both nonprofit, both offering a free product for the greater good and both rely on donations. Both will have costs that scale - they might not be the same to-the-penny but they will exist. Thats just the nature of the beast.
But from where will we get the oil!?! ๐ฅ