Unfortunately Northampton is a rugby town, even when the saints got relegated they were still getting 10K crowds.
The Saints have a vast catchment area, they get lots of support from East Anglia and they have an academy in Bury St Edmunds !!
But the still only took 19000 to a European Cup Final when we have took 43000, 32000 and 23000 to lower league play off finals, Rugby town