Hosting a grey cup is a profitable season no matter how dire things go, usually at least. You're also thinking too short, this wasn't a one year plan based on the work they've put in for Argos, which is my point.
As for the playing surface? It's held up all season and I see day to day how much goes into caring for it. So the opposite is happening, they have put more into the field than ever before. No cutbacks to the field are on anyone's radar at MLSE.