Milwaukee makes one point that is the truth - it's all about the money.
One reason i think fans in stands - at least large numbers of them, is less likely than the game themselves is that from a money standpoint it is not about the cities, it is about the AA's and their desire to make sure they get as much of the TV money as they can to reduce how many sports and how much staff they are going to have to cut. Anything after that is gravy.
From their early statements of it being all about the safety and well being of the SA's to it being about not having to cut sports and budgets, ultimately the AD's want to play as many games as possible to maximize how much TV revenue they ultimately receive. if their best chance of maximizing games is minimizing fans, they will go that path.
Keep in mind that they are going to be losing revenue all over the place. Smaller season ticket sales, if fans are allowed but in smaller numbers than advertising revenue will be reduced as there are fewer eyeballs in the stadium to see all the banners and ads on the Jumbotron. Possibly fewer suite sales or at lower prices.
On to a few other sports related notes.
Just showing how hard this is going to be in any sport, much less one with alot of physical contact - PGA now has 4 golfers out -2 due to the golfer testing positive and 2 due to the golfer's caddie testing positive and the golfer saying they will self-quarantine.
Berlin and NYC have both cancelled their marathons today.
From a football scheduling standpoint, the Patriot League has announced their protocols for playing football this fall. They include no SA's will be on campus before the regular students arrive, so basically none of the Patriot league schools will be able to meet the week 1 start date. Also, no travel to anywhere that requires a flight or a stay over night. There are others but just those 2 all but guarantee that most of the out of conference games scheduled between Patriot league teams and others (Syracuse has a game against a Patriot league team), will likely not occur.