I did a *little* research re: D-1 v. D-3 attendance, while expecting to thereby support your point, and I was a bit surprised to see the 2012/2013 numbers on here.
True enough, AIC and Sacred Heart drew miniscule crowds, but there were very few D-1 teams which had fared so badly in that regard. (Utica, which lead D-3 in attendance last year, would have finished 20th by a wide margin had they played in D-1, and there were very few D-3 teams that would have cracked the top-35 in D-1 last year in terms of attendance.)
Still, who cares..? D-3 hockey is great fun to watch, and it's nice not to worry about getting a perfect seat on the road, let-alone getting any seat in the first place. I don't need a big crowd on hand to get me interested in a hockey game.