Compared to the London advertising market??
Edit: Jacksonville is #47 https://en.wikipedia.org/wiki/List_of_television_stations_in_North_America_by_media_market
Games in London allow the NFL to add another game slot. So now you can have 10am, 1pm, 4pm and 8pm games on the east coast.
Do you seriously think the NFL would make this decision on a whim and hasn't spent millions analyzing the data?