Another possible aspect:
From a long term perspective, Delaney is probably hoping to see resurgence from the new additions. With all the Big Ten Network cash, it could happen quickly. Fan growth will be a bit slower, but I see this as a 10-20 year project to create more fans in that area. Also, the states in the northeast have huge numbers of alumni from the Big Ten.
And of course, the money is the main point. Even if the growth in popularity never materializes, it doesn't matter. There are probably already enough CFB fans in those areas to get the network on most big cable companies.
I am in Florida. Tampa. When NU moved to the Big Ten, all of the local cable companies either already had it on the basic packages or moved to do so shortly after. The Big Ten Network was why I switched, at the time, to another company. Within a couple months, and before the season, all local companies had it on the basic package. There are a lot of Big Ten fans in Florida, too, and I was thrilled and surprised at just how many, once I started looking into it.