My dad was a big ND fan as he was from Ireland. He slowly switched as his 2 oldest sons went to BC. But he was somewhat perplexed at first when BC played ND.Ok, I just looked it up. BC's five year average was 34k.
It's a joke that ND has more fans in Boston than BC. I'd say that's a combination of winning football and deceptive marketing.
How a French school in the middle of a cornfield in Indiana co-opted Irish pride from the school founded by Irish Catholics in a bastion for Irish immigrants in Boston is amazing.