You're too hung up on the attendance number, and I won't continue to speculate on that point. Even if there are 5 fans in the stands (me and the group I'm bringing), and nobody else, we still get:
-a neutral court game (NBA arena, like Cleveland and tourney) vs. a tourney team.
-More material to point at when recruiting, "In the past 4 years we've been invited to events in Toronto, Dublin, Cayman Islands, Charleston, etc."
-Some degree of brand recognition from any marketing/buzz around the event (whether the average Canadian knows or cares is besides the point, D1 caliber kids in the area will know/care).
-Potentially a national TV game? Television info hasn't been released yet.
To me that is worth giving up one middling weekend game, sucks for the people that wanted to see Dartmouth but they can 1) go to Toronto 2) watch it on TV 3) go to one of the 14 other home games this year.