You are comparing apples and oranges. There's relatively little cost to hosting a college basketball game, particularly one using the Nets floor as LIU and St. Peter's did. In fact, the same floor was used for a Net's game the night before and a high school hoops festival the next day. It's something else to have to pull up the floor, make ice (they aren't going to keep ice under the basketball floor with no hockey tenant), install boards and then reverse the process for another basketball game in subsequent days.
Barclay's, or any part of it, wasn't designed with college hockey in mind. If the awful hockey layout that was created for the Islanders wasn't a clue (pushed to one side with most seats remaining at that end obstructed view or just not sold), here is the description from the Barclay's Center website when they started construction:
"The 850,000-square-foot, state-of-the-art sports and entertainment venue will be home to the professional basketball team the Brooklyn Nets. For the first time since the Dodgers left in 1957, Brooklyn will have a major league sports team to call its own. The Barclays Center will welcome some of the most exciting sports and entertainment events in the world: concerts, fine arts performances, circuses, college basketball games, ice shows, and music award shows are just some of the possibilities."
Note what was missing - any mention of hockey (not even an NHL exhibition game). That's why they installed a PVC-based system for their primary use - ice shows. Below is another article which cites the developer's own plan for the arena schedule. Once again, it doesn't mention hockey, much less college hockey.
https://www.netsdaily.com/2007/8/26/...about-brooklyn
They need to field a team and get competitive before inviting Michigan, Cornell or any other program to play at a major arena and, even then, they'd be better served using one whose design and cost structure give them a chance for success.