The term “bring a market” is stupid because it has no set definition. The real question was how many cable boxes do you bring and how many actual eyeballs do you bring. To the extent it cared about college sports, San Diego had always been PAC however many territory and doesn’t add cable boxes (to the extent that matters any more). And without any data, so if I’m wrong and someone has data so be it, I would guess RU brings more eyeballs than SD State as well.
Rutgers addition made sense for The B1G when it happened, and it still does now. The conference couldn't ignore the massive Land Grant University contiguous not only to a conference member, but to the NYC TV Market. The creation of the B1G Network took it from future possibility to absolute certainty. Their AAU Status got the rubber stamp from the academic wonks in charge.
Rutgers history of athletics prior to the B1G has been mostly trash with periods of mediocrity. Other than football, which has rode the struggle bus since joining the conference, they have greatly improved from their historical performance. Sports like Lacrosse, M/W Soccer, M Basketball and a few others have been competitive. They will never be the USC of The East as Rutgers Al once predicted, but they are slowly becoming serviceable in most sports outside of football.
Rutgers alone is not going to drive viewership. However, Rutgers playing Penn State, Ohio State, Michigan, Wisconsin etc. will. San Diego State does not have that luxury because outside of the rare event like playing in The Final Four, no one on the west coast would care to see Cal play San Diego State or Oregon play SMU. This is doubly true as a part of a streaming package.